The text search engine allows queries to be formed from arbitrary Boolean expressions
containing the keywords AND, OR, and NOT, and grouped with parentheses. For example:
Irish Culture
finds documents containing 'Irish' or 'Culture'
Irish OR Culture
same as above
Irish AND Culture
finds documents containing both 'Irish' and 'Culture'
Irish NOT Culture
finds documents containing 'Irish' but not 'Culture'
(Irish NOT Culture) AND ICS
finds documents containing 'ICS', plus 'Irish' but not
'Culture'
web*
finds documents containing words starting with 'web