Perhaps you should try some spelling variations:
"medical / regenerative medicine" » "medical / regenerating medicine", "medical / reregenerative medicines", "medical / reoperative medicine"
"medical / generative medicine" » "medical / generating medicine", "medical / regenerative medicines", "medical / operative medicine"

Try widening your search to All Fields.

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"medical / regenerative medicine\") OR (\"medical / generative medicine\"))".
• Removing quotes may allow a broader search: (( medical / regenerative medicine ) OR ( medical / generative medicine )).
• Adding a wildcard symbol may retrieve word variants: (("medical / regenerative medicine") OR ("medical / generative medicine"))*.