Thus bug may exist in previous versions, I don't have another copy available to test.
Ran a Bible search on the word Fool limited to the gospels. Only had one result:

Expanded the search to include the whole NT and did not get much better results. Ran a Basic search on the ESV for Fool and the results looked better.
Is this a problem with my index or something with the search function? I'll reindex my library and see if it does better.