You have some keywords to start searching with - but you don't know yet if you actually have the words that will really match well with the metadata labels on the database items.  But don't worry - because you WILL (quickly) find more versions of your keywords!

You’re seldom going to get the perfect set of results from that first search you run.

Your search - and your 'search query' - evolves as you go along. You will find alternate words and synonyms...

• in result titles
• in the abstract (the short synopsis of what the book or article is about)
• within the book or article’s text
• in subject terms / indexing terms (the words that databases use to ‘file’ / index their documents).
  • A search result's 'indexing terms' are often listed somewhere near the search result's abstract.