Perhaps you should try some spelling variations:
communicate diseases » communicable diseases, communicable disease, complicated diseases
communicated disease » communicable disease, communicable diseases, complicated diseases
mediated diseases » related diseases, medical diseases, related disease

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: (( communicate diseases ) OR ((( communicated disease ) OR ( mediated diseases )))).
• Adding a wildcard symbol may retrieve word variants: (( communicate diseases ) or ((( communicated disease ) or ( mediated diseases ))))*.