Use OSCAR, the library catalog, to find books on your topic.
For instance, entering the word 'scientology' in the 'simple search' box will retrieve everything that has that word somewhere in the catalog record.
Notice the subject headings in the full catalog records for tips on other search terms to use. In this case, another useful term would be 'dianetics'.
Doing another search on the subject heading hotlink for 'scientology' that you found in the catalog record may bring up other hits on the topic that did not have the word 'scientology' in the catalog record.