Problem getting results from basic Keyword search

I did a basic keyword search for a word that should have had hundreds of title results, but I got 0 results. The same search worked fine as an advanced search, and I got results when the term was not part of a title field. My site is spirituals-database.com. Any ideas of what is causing the problem and how to fix it?

Thanks!

Does anything in the troubleshooting searching section apply here - something which would be in more than 50% of indexed terms, or is fewer than four letters?