Some databases are one line searches. You can usually search these as one would Google:
Annee:
Others have a multi-line search. At first, you may not like the idea of separating your search terms, but doing so allows you to brainstorm alternate terms and separate them by OR. Only one of the terms on the second line, below, needs to be present in the results, but any of them can be.
Academic Search Complete:
MLA: