Boolean Operators
Boolean operators can be used 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