RewriteEngine On
RewriteCond %{HTTP_REFERER} ^http://(www\.)?.*(-|.)?keyword(-|.).*$  [NC,OR]
RewriteCond %{HTTP_REFERER} ^http://(www\.)?.*(-|.)?key\+word(-|.).*$  [NC,OR]
RewriteCond %{HTTP_REFERER} ^http://(www\.)?.*(-|.)?key%20word(-|.).*$  [NC,OR]
RewriteCond %{HTTP_REFERER} keyword [NC,OR]
RewriteCond %{HTTP_REFERER} key\+word [NC,OR]
RewriteCond %{HTTP_REFERER} key%20word [NC]
RewriteRule ^.* http://myurl.com [R=301,L]