Use Library Search to discover resources by topic across the majority of Library resources. Library Search covers print and electronic books, articles, e-journals, newspapers, theses and more.
Simple keyword searching is one approach. The relevancy ranking combined with the Topic facet in the right side-bar may be sufficient for you to discover suitable information resources on your topic.
Advanced Search offers you more control. You can choose to look for keywords in a subject field. This field contains headings assigned by cataloguers describing what the resource is about. The title is also a good choice, though not all titles are descriptive of the work itself.