Boolean logic defines logical relationships between terms in a search. The Boolean search operators are AND, OR and NOT. Type the operators IN CAPITALS.
Boolean operator AND is used in the basic search by default. This means that you will receive the same results by using either the following searches:
media "hate speech"
media AND "hate speech"
OR-operator combines search terms that refer to the same meaning. Each search result contains at least one of the terms:
elderly OR aged OR "old people"
To specify the order in which the operations are implemented, you can enclose search terms and their operators in parentheses . Information within parentheses is read first, then information outside parentheses is read next. OR-operations must always be completed first:
(elderly OR aged OR "old people") AND welfare
(education OR training) AND (interpreter* OR translator*)
The operator NOT is always performed the last:
cycling AND safety NOT helmet