Perhaps you should try some spelling variations:
"communicated diseases" » "communicable diseases", "communicable disease", "communicate disabled", "communicable diseasess", "communicate states"
"communicated disease" » "communicable disease", "communicable diseases", "communicate state"
"complicated diseases" » "complicated cases", "complex diseases", "mediated diseases"
"related disease" » "related diseases"

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