Records in library databases are comprised of fields containing specific pieces of bibliographic information. Common fields include:
Limiting your search to specific fields can retrieve better and more accurate results.
For instance, if you are looking for books written by Sidney Sheldon you should to limit your search to the author field.
To find various fields within a database, look for drop down boxes or menus to select the field you want to search.
Then combine words and fields together with boolean or proximity operators, depending on how precise you want to be.