Operators
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      Boolean Operators

      Boolean operators allow the user to combine or exclude keywords, country codes, dates, other search strings, and other search fields in a search query.

      Boolean operators may be used to combine or exclude multiple terms within one expression or multiple queries from the Timeline. 

       AND

      All terms must be present

      boat AND propeller

       OR

      Either or both terms are present

      car OR vehicle OR truck

       NOT

      The term following NOT is excluded

      bass NOT fish

      Different methods of using Boolean operators

       

      Basic search query with Boolean operators

      TA=((lap_top OR desktop OR pc) AND (power OR battery OR charg*))

      Combining multiple fields and associated expressions

      TA=(lap_top OR desktop OR pc) AND FT=(Charg* 3D cable?)


      Combining non-text fields such as dates with text fields such as title and abstract

      TA=((lap_top OR desktop OR pc) AND (power OR battery OR charg*)) AND CC=US AND PUBD>=2002-07-04


      Combine or exclude results from multiple search queries in the Timeline

      (1 OR 2 OR 3) AND 4 NOT 5