The Boolean operators allow you to refine your queries to focus on more specific or more general information than may be found with a single word or phrase search.
Boolean connectors require a word or phrase on either side of the operator.
For example, negligent or intentional is a valid query, but or intentional is not. And, Or, Not, Exclusive Or. The Or operator may be specified by the word or. The query operators have a precedence order. That is, when two more operators are used in a query, the results of one operator will be evaluated before another operator.