Once you have done a search, you can use the catalogue records of listed subjects to identify more keywords, and more, related items.
A good way to begin your research is to find background information in reference sources, such as dictionaries and encyclopedias.
Dictionaries help you understand what words mean.
Thesauri help you find words that have the same meaning.
The Library has a large collection of dictionaries and encyclopedias on the shelves.
Finding more resources about the same subject