Browse the results list of your keyword search and look at the full records to see the subject headings assigned for relevant titles. Note that the results are sorted by relevance. You can change the results to sort by date, author, or title. Click on the subject headings to find more books on your topic.
After you find a relevant book on your topic, you can also browse the catalogue by the Library of Congress call numbers to find more titles.
Please keep in mind that the classification system used in academic libraries often does not use terminology or language that reflects the current appropriate language or terminology, and can in some instances be offensive.