Perhaps you should try some spelling variations:
"complicated diseases" » "complicated cases", "complex diseases", "mediated diseases"
"communicated disease" » "communicable disease", "communicable diseases", "communicate state"
"communicate states" » "communicate state", "communicate strategy", "communicative status"

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