Interesting.... hmmm.... Aha!

The problem is in the tag search itself. I did a test on two different videos that have two different tag setups. The one you listed has tags space delimited. Another video that I uploaded more recently has tags comma delimited. On the space delimited tags, the tag search does work (probably because the search function is searching for exact tags versus using the LIKE functions. This would mean that the search would have to know that there are spaces between the tags to get a match. With commas, the screening functions will detect it as a delimiter and will separate each tag out as individual words so that when you search for, say, "booty," it will find all references to it.

The simple fix to this is to change all of your tags to comma delimited. In the next release, however, this may be fixed altogether as I hear that there will be a much improved search system in the next release.