Perhaps you should try some spelling variations:
"communicate disabled" » "communicate discover", "communicated disease", "communicate defined"
"complicated diseases" » "complicated cases", "complex diseases", "mediated diseases"
"communicate listen" » "communication listen", "communicate like", "communicate better"
"medical diseases" » "tropical 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: (((((("communicate disabled") OR ("communicate listen"))) OR ("communicable diseases"))) OR ((("complicated diseases") OR ("medical diseases")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"communicate disabled\") OR (\"communicate listen\"))) or (\"communicable diseases\"))) or (((\"complicated diseases\") or (\"medical diseases\"))))".
• Removing quotes may allow a broader search: (((((( communicate disabled ) OR ( communicate listen ))) or ( communicable diseases ))) or ((( complicated diseases ) or ( medical diseases )))).
• Adding a wildcard symbol may retrieve word variants: (((((("communicate disabled") OR ("communicate listen"))) or ("communicable diseases"))) or ((("complicated diseases") or ("medical diseases"))))*.