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:
- cervix radiotherapy
- finds documents containing 'cervix' or 'radiotherapy'
- cervix or radiotherapy
- same as above
- cervix and radiotherapy
- finds documents containing both 'cervix' and 'radiotherapy'
- cervix not radiotherapy
- finds documents containing 'cervix' but not 'radiotherapy'
- (cervical not radiotherapy) and hyperbaric
- finds documents containing 'hyperbaric', plus 'cervix' but not 'radiotherapy'
- cerv*
- finds documents containing words starting with 'cerv', e.g., cervix and cervical
