Belarius

As far as I can tell, cohost's search functions have very limited functionality, on purpose. Now that the site's been running a while, this creates a rather curious conundrum, because there's a lot of good content that's rather difficult to surface without some extra information, often of a more social sort (e.g. "I think I remember that such-and-such shared that one").

As a minimum, though, you can always manually enter the tag you're looking for into the 'tagged' URL. If you do so, be careful about capitalization - cohost sticks with the first observe use of a character string, so "vr" is now forever a lower-case tag and "VR" won't turn up anything at all. But that doesn't solve your multi-tag search problem, which (so far as I'm aware) is not currently possible.