It looks like you're using Internet Explorer 11 or older. This website works best with modern browsers such as the latest versions of Chrome, Firefox, Safari, and Edge. If you continue with this browser, you may see unexpected results.
books are usually on a general topic, and might cover many specific things - broaden your search to a more general topic to try and find information
for example - looking in the catalogue for books on ELISA - if you type "ELISA" into the search box, you will get many books, but not many are on Enzyme-linked immunosorbent assay. Try a broader topic. The entire book might not be on ELISA, but there might be a chapter or two on it.
Use synonyms, broader terms, narrower terms, acronyms, etc.
for example - Searching "ELISA" and "Enzyme-linked immunosorbent assay" will bring up different results
the catalogue looks for what you type in, so the words you use matter