Default search should use AND with each word.

Instead of querying for an exact match in the database, we should search for
entries that match all of the words, no matter the order they are typed in.

Fixes: http://bugs.async.com.br/show_bug.cgi?id=5478
Change-Id: I37ee8187b325d6a5fd5d1c8abbd00f03d9dd81d9