In Factbook Search,
Catholic Church -> hits
Catholic AND Church -> same hits (as expected)
Catholic OR Church -> same hits again...
Catholic THEN Church -> different hits (algorithm unclear)
Church THEN Catholic -> different hits than previous search (as expected)
Catholic near Church -> uniquely different hits (as expected)
Catholic NEAR Church -> blank results
Catholic ANDNOT Church -> blank results
Thomas ANDNOT Aquinas -> blank results