AND, OR, NOT
e.g. If you type Victorian AND garden, you will find documents that contain both keywords.
e.g. If you type "garden city" in quotation marks, you will find documents that contain this phrase.
e.g. If you type manufactur*, you will find documents that contain the words manufacture, manufactured, ...
e.g. The question mark (?) will match any one character and can be used to find Olsen or Olson by searching for Ols?n.
Operators may vary from database to database: consult specific database help pages for more information.