Get the site_id from the sites table, and try the following in an HTML form:
HTML Code:
<input type='hidden' name='site' value='SITE_ID' />
<input type='hidden' name='path' value='kb/faq/' />
<input type='hidden' name='refine' value='1' />
Alternatively, you could set $site, $path, and $refine in the search.php file.