Try out alternate keywords for your topic to see what gets you the best results. For example:
When you put quotation marks around a phrase in a search, it is telling the search engine or database that you only want results with those words together.
Just typing in African Americans (with no quotes) will get you:
Wildcards take the place of one or more characters in a search term. They're handy when there are a lot of variations on a word, but all of them would match your search. For example:
will bring up results for