This search screen now remembers your previous search. If you wish to clear the old one out, you'll need to restart your browser. I'm working on a better solution.
For the "Has Any" checkbox lists, selecting one item will show only spells with that item, selecting two (or more) will show spells that have either or both (or all).
Leaving any of these empty/not selected/not entered will cause the search to ignore that spell attribute.