Quite simple, really. When searching, you get tags as results. However, you'd probably be interested in pools with the word in it as well?
For example I'm gonna be making a pool involving interesting hand poses for artists, but if someone were to search hand, they'd just get the couple of images that are tagged "hand".
I wouldn't necessarily say that the searcher would want to see all the images, but perhaps a link at the top in a gray frame saying "the following pools were found: Artist helper: Hands" (or whatever).