Choose a field to search on, e.g. Author, Title, Keywords and so on. Select the Boolean operators AND,OR,AND NOT
More Search Options

Publication Year : From To
Level :
Language :
Document Type :
Education Category :

1. The drop-down menu allows you to specify the fields (author, title or keywords/phrase) in which words should appear.
2. Enter a word or phrase into the search field. You may use truncation or proximity searching.
  (For more information on using these, see the User Guide on Search Tips.)
3. To combine your search with additional search words, you can:
   Choose the operators, AND, OR, and AND NOT from the drop-down menu. (For more information on using
  operators, see theUser Guide on Search Tips.)
   Continue adding words as needed.
4. When you finish entering your terms, click Search

You can narrow down your search by choosing the limit options from the drop-down menu to get fewer, or better results:
   Publication Year
   Document Language
   Document Type
   Education Category