Thread:Peteparker/@comment-26832713-20161009004235/@comment-122657-20161009041418

I've actually already built a template for that: Template:Multi-Category Search. I'm not against installing something that does more, or does it better, but it would probably be fastest to try this first.

A word of caution, the template uses server-heavy resources, so it should only be used on sandbox pages where it can be deleted when the user has the information they need.