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