Using Our Search Engine - The text search engine allows queries to be formed from arbitrary expressions containing the keywords AND, OR, and NOT, and grouped with parentheses. For example:
finds pages containing 'workplace' or 'accident'
workplace or accident
same as above
accident and Pittsburgh
finds pages containing both 'accident' and 'Pittsburgh'
workplace not accident
finds documents containing 'workplace' but not 'accident'
(workplace not accident) and insurance
finds documents containing 'workplace' plus 'insurance', but not 'accident'
finds documents containing words starting with 'employ'