To make your search more efficient, use the following operations and symbols in the boxes Word in the title and Word in the text:

• AND
  Both words given must be present. If two words are separated by a space character, the AND operator is assumed as a default.
  
  

• OR
  Either (or both) of the words given must be present.
  
  

• NOT
  The first word must be present, the second word must not occur in the text.
  
  

• " " (quotation marks)
  Text enclosed within quotation marks is treated as one character string, including spaces in it.
  
  

• ( ) (parentheses)
  Use parentheses and the operators AND, OR, NOT to construct more complex search conditions.
  
  

Operators AND, OR, NOT are written in capital letters and are preceded and followed by a space.