Saat 12'e kadar koymazsan dönüşmez Turan'ım 
RewriteEngine On
RewriteBase /
RewriteRule ^search/?kod=(.*?)$ urun_etiket/$1/ [NC,L]

RewriteEngine On
RewriteBase /
RewriteRule ^urun_etiket/(.*?)/$ search/?kod=$1 [NC,L]