Perhaps you should try some spelling variations:
medical ontology » medical oncology, medical ontologies, medical sociology
lexical ontology » social ontology
medical history » medieval history, media history, medicine history

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((((medical ontology) OR (lexical ontology))) OR (medical history)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((medical ontology) OR (lexical ontology))) or (medical history))".
• Adding a wildcard symbol may retrieve word variants: ((((medical ontology) OR (lexical ontology))) or (medical history))*.