merhaba sitemde arama yaptığımda en az 4 harfli kelimeler için sonuç çıkıyor

ben 3 harfli kelimlerde de sonuç versin isitiyorum
mesela mp3 , dvd , zip , gibi kelimler
bunun için ne yapmam nereyi değiştirmem gerekir acaba
arama.php aşağıdaki gibidir

<?
include("ayar.inc.php");
include("fonksiyonlar.inc.php");
$__TITLE__ = $_GET["kl"]." download";
include("ust.php");
$kategori = $_GET["kategori"];
$kl = $_GET["kl"];

if( strlen( $kl ) <= 2 )
    echo("<script language=\"Javascript\">\n<!--\n alert(\"Aranacak kelime en az 3 harften oluşabilir.\");\n window.location.href=\"/aranan.php\"; \n-->\n</script>");

mysql_connect ($dbhost, $dbuser, $dbpass) or die (mysql_error());
@mysql_select_db ($dbname) or die (mysql_error());

if(mysql_query("INSERT INTO arama (id, kelime, hit) VALUES (null, '$kl', '1')"))
 echo("");
else
 mysql_query("UPDATE arama SET hit = hit + 1 WHERE kelime = '$kl'");

$sayfada_gosterilecek_program_sayisi = 20;

if($baslangic == "") $baslangic = 0;

if($kategori == 0)
{
$dnm = mysql_query("SELECT *, MATCH(prog, fulldesc, url_down) AGAINST('$kl') AS skor FROM progs WHERE MATCH(prog, fulldesc, url_down) AGAINST('$kl') AND status=1 ORDER BY skor DESC limit $baslangic,$sayfada_gosterilecek_program_sayisi") or die(mysql_error());
$dnm2 = mysql_query("SELECT * FROM progs WHERE MATCH(prog, fulldesc, url_down) AGAINST('$kl') AND status = 1");
}
else
{
$dnm = mysql_query("SELECT *, MATCH(prog, fulldesc, url_down) AGAINST('$kl') AS skor FROM progs WHERE MATCH(prog, fulldesc, url_down) AGAINST('$kl') AND status=1 AND catid='$kategori' ORDER BY skor DESC limit $baslangic,$sayfada_gosterilecek_program_sayisi") or die(mysql_error());
$dnm2 = mysql_query("SELECT * FROM progs WHERE MATCH(prog, fulldesc, url_down) AGAINST('$kl') AND status=1 AND catid='$kategori'");
}

$sonuc = mysql_num_rows($dnm);
$program_sayisi = mysql_num_rows($dnm2);
echo(mysql_error());
?>

<table width="100%" border="0" cellspacing="0" cellpadding="2" bordercolor="#0066cc" align="center" class="cizgiCopy">
  <tr>
    <td><b> <font face="Verdana" size="1"><a href="index.php">Anasayfa</a> > <? echo($kl." aramasında ".$program_sayisi." sonuç bulunmuştur"); ?></font></b></td>
    <td>&nbsp;</td>
  </tr>
  <tr>
    <td valign="TOP">
      <table>
        <tr>
          <td>
            <?
if($program_sayisi != 0)
{

?>
            GOOGLE 336x280
            <?
}
?>
          </td>
        </tr>
        <?
while($row1 = mysql_fetch_array($dnm)) {
$url = "http://www.site.com/download.php?pid=".$row1["pid"];
$aciklama = "";
$aciklama = substr($row1["fulldesc"], 0, 100);
//$aciklama = wordwrap($aciklama, 100, "<br>\n");
$detay_link = detay_link($row1['catid'],$row1['prog'],$row1['pid']);

echo("<TR><TD BGCOLOR=\"#ffffff\" ID=\"taw1\" CLASS=\"ch\" ALIGN=\"left\" VALIGN=\"center\">");
echo("<DIV STYLE=\"overflow:hidden; width:332px; padding-left:2px\"><FONT STYLE=\"line-height:14px;font-size:11px\" FACE=\"arial,sans-serif\" COLOR=\"#000033\">");
echo("<FONT STYLE=\"line-height:14px;font-size:11px\" FACE=\"arial,sans-serif\" COLOR=\"#000033\"><A ID=\"aw1\" TARGET=\"_top\" HREF=\"$detay_link\" class=\"ch\"><B><u>".ucwords(strtolower($row1[prog]))." ".ucwords(strtolower($row1[ver]))."</u></B></A> <BR>");
echo("</FONT><FONT STYLE=\"line-height:14px;font-size:11px\" FACE=\"arial,sans-serif\" COLOR=\"#000000\">".ucwords($aciklama)."<br>");
echo("</FONT><A TARGET=\"_top\" HREF=\"$detay_link\"><FONT STYLE=\"line-height:14px;font-size:10px\" FACE=\"arial,sans-serif\" COLOR=\"#0000ff\">".str_replace("http://","",$detay_link)."</FONT></a>");
echo("</FONT></div><br></td></tr>");
}
?>
        <tr>
          <td>
            <!--<script language='JavaScript' type='text/javascript' src='http://reklam.ejder.com/adx.js'></script>
                        <script language='JavaScript' type='text/javascript'>
<!--
   if (!document.phpAds_used) document.phpAds_used = ',';
   phpAds_random = new String (Math.random()); phpAds_random = phpAds_random.substring(2,11);
   
   document.write ("<" + "script language='JavaScript' type='text/javascript' src='");
   document.write ("http://reklam.ejder.com/adjs.php?n=" + phpAds_random);
   document.write ("&amp;what=zone:16&amp;target=_blank");
   document.write ("&amp;exclude=" + document.phpAds_used);
   if (document.referrer)
      document.write ("&amp;referer=" + escape(document.referrer));
   document.write ("'><" + "/script>");
//-->
            </script>
            <noscript>
            <a href='http://reklam.ejder.com/adclick.php?n=a1951943' target='_blank'><img src='http://reklam.ejder.com/adview.php?what=zone:16&amp;n=a1951943' border='0' alt=''></a>
            </noscript>
            --> </td>
        </tr>
      </table>
      <p>Aradığınız programı bulamadıysanız bir de aşağıdaki siteleri deneyin :<br>
        » <a href="http://www.tamindir.com/ara.asp?field=<?=$kl;?>">TAMindir</a> &nbsp; 
        » <a href="http://www.linkcenneti.com/arama.php?kelime=<?=$kl;?>">Linkcenneti</a> &nbsp; 
        » <a href="http://tr.ejder.com/web-search.php?search=<?=$kl;?>">Google</a></p>
    </td>
    <td width="120" valign="TOP"> </td>
  </tr>
</table>
<table align="CENTER">
  <tr>
    <td>
      <?
$onceki = $baslangic - $sayfada_gosterilecek_program_sayisi;
$sonraki = $baslangic + $sayfada_gosterilecek_program_sayisi;

echo "<font size=3 face=tahoma>";
if($baslangic >= $sayfada_gosterilecek_program_sayisi) 
{
echo "<a href=\"".$_SERVER[PHP_SELF]."?catid=$catid&cat="."$cat"."&baslangic=".$onceki."\"><- Önceki Sayfa</a> ";
}

$dnm = $program_sayisi / $sayfada_gosterilecek_program_sayisi;
$dnmx = (int)$dnm;
$dnmy = $dnmx * $sayfada_gosterilecek_program_sayisi;
if($dnmy < $program_sayisi) $dnmx++;

$x = 1;
$qwerty = 0;

for($x = 1;$x <= $dnmx; $x++)
{
 echo "<a href=\"".$_SERVER[PHP_SELF]."?kl=$kl"."&baslangic=".$qwerty."\">[".$x."]</a> ";
 $qwerty += $sayfada_gosterilecek_program_sayisi;
}

if($sonraki <= $program_sayisi) 
{
echo "<a href=\"".$_SERVER[PHP_SELF]."?kl=$kl"."&baslangic=".$sonraki."\">Sonraki Sayfa -></a>";
}

echo "</font>";
?>
    </td>
  </tr>
</table>
</CENTER>
<?
include("alt.php");
?>