0.2
Of course. You select all the files matched by a set of tag with something like:
$ ls tags/rock/AND/seventies/
$ ls tags/grunge/AND/cover/
Let say that you need the results from those two queries listed together. Just use one OR operator to join the queries, like in:
$ ls tags/rock/AND/seventies/OR/grunge/AND/cover/
That's it!