Feedback from an user:

I have a minor reccomendation (not important). In the explanation of the search rules with OR operator:

"In order to search using a logical-OR, add search terms to the text boxes separated by a single comma."

It could be useful to allow the "bar space" after the comma. I mean: "eifanfaces,fisherfaces" works well 
as in the example but not "eifanfaces, fisherfaces". It will be very common error in my opinion (it was 
my error :)).  If it is not possible, you could add a warning about the use of space:

"In order to search using a logical-OR, add search terms to the text boxes separated by a single comma
(without bar-space between terms)."

For those who read fast the instructions.