You can also encapsulate words in quotes when searching the tracker.
For example, searching for:
David Bowie
Would produce results with the word "David" and/or "Bowie".
Searching for:
"David Bowie"
Would produce results with the phrase "David Bowie".
Also, by default, the search only returns back active torrents. If you want a complete picture, you have to check the "including dead torrents" checkbox.
For example, searching for "Santa Monica" on its own didn't bring back the aforementioned show. However, by clicking the little checkbox, I did get this in my results set:
http://www.mindwarppavilion.org/ezt/torrents-details.php?id=436Which happens to be the show in question.

Anyway, the search functionality on the tracker, while extremely powerful, is not very user friendly. Once I get the server stuff I am working on all sorted, I hope to start working on the Gallery and Tracker, getting these up to speed with the Forum.