Do a search for a phrase in quotes (e.g., largetext:"kings of judah")
Search hit highlighting shows partial results when those are not actually in the search hits. The word "kings" should not be highlighted unless it is part of the phrase "kings of judah" in this example:

EDIT: Duh! Never mind. I had another Search panel open that had a search for "Kings" with "Match all word forms" turned on. Sorry for the false alarm.