There are say two categories Medical and Med-Pharma and I have link searches. The following work fine.
<a href="http://www.xyz.com/cgi-bin/dir/search.pl?query=&Category=Medical">Medical</a>
<a href="http://www.xyz.com/cgi-bin/dir/search.pl?query=&Category=Med_Pharma">Med Pharma</a>

However the following doesn't work (ie is results from both the categories).
<a href="http://www.xyz.com/cgi-bin/dir/search.pl?query=&Category=Med">Medical & Med Pharma</a>

I would like to use common letters (in this case Med) to search all the categories containing the letter 'Med'

Any suggestions as to what changes need to be made.