Perhaps you should try some spelling variations:
"communicated diseases" » "communicable diseases", "complicated diseases", "communicable disease", "communicable diseasess", "complicated diseasess"
"communicated disease" » "communicable disease", "communicable diseases", "complicated diseases"
"mediated diseases" » "related diseases", "medical diseases", "related disease"
"complicated case" » "complicated cases", "complicated acute", "complicated chapter"

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: (((("communicated diseases") OR ("communicated disease"))) OR ((("complicated case") OR ("mediated diseases")))).
• Removing quotes may allow a broader search: (((( communicated diseases ) or ( communicated disease ))) or ((( complicated case ) or ( mediated diseases )))).
• Adding a wildcard symbol may retrieve word variants: (((("communicated diseases") or ("communicated disease"))) or ((("complicated case") or ("mediated diseases"))))*.