Perhaps you should try some spelling variations:
medical ontologies » biomedical ontologies, medical oncology, medical technologies
medical ontology » medical oncology, medical sociology, medical mycology
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 ontologies))) OR (medical history)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((medical ontology) OR (lexical ontology))) or (medical ontologies))) or (medical history))".
• Adding a wildcard symbol may retrieve word variants: ((((((medical ontology) OR (lexical ontology))) or (medical ontologies))) or (medical history))*.