Perhaps you should try some spelling variations:
"communicated diseases" » "communicated disease", "complicated diseases", "communicable disease"
"communicate diseases" » "communicated disease", "communicable disease", "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: (((("communicable diseases") OR ((("communicate diseases") OR ("mediated diseases"))))) OR ("communicated diseases")).
• Removing quotes may allow a broader search: (((( communicable diseases ) or ((( communicate diseases ) or ( mediated diseases ))))) or ( communicated diseases )).
• Adding a wildcard symbol may retrieve word variants: (((("communicable diseases") or ((("communicate diseases") or ("mediated diseases"))))) or ("communicated diseases"))*.