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This search
engine allows queries to be formed from arbitrary Boolean expressions
containing the keywords AND, OR, and NOT, and grouped with parentheses.
For example:
health
policy
finds
documents containing 'health' or 'policy'
health
or policy
Same
as above
health
and policy
finds
documents containing both 'health' and 'policy'
health
not policy
finds
documents containing 'health' but not 'policy'
(health
not policy) and states
finds
documents containing 'states', plus 'health' but not 'policy'
health*
finds
documents containing words starting with 'health'
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