Start with a keyword search in the catalog. Once you have located a relevant item, you can look at the Subjects in the record and follow those links to find related books.
You can refine your results by using the facets on the left side of the screen. Use the "Available Online" filter to limit to materials that may be accessed remotely. Under "Resource Type" you can restrict your results to books, journals, or government documents.
You can also pair these suggested subject headings with additional keywords on specific aspects of your topic.