Using CloudSearch to find commentaries or articles about biblical books is not generally difficult; however, in the case of Bible books where there is a second or third book, using Roman and Arabic numerals as part of the search gets tricky. I contacted our Support office to find the best advice. They recommend something like this.
((i Kings) OR (1 Kings)) AND commentaries
You can click on this search to see how the results look. Books of both Old and New Testaments would be phrased as the example demonstrates.