Perhaps you should try some spelling variations:
"communicate discover" » "community discovery", "communicate disabled", "communications over"
"communicated disease" » "communicable disease", "communicate state", "communicated vision"
"complicated diseases" » "complicated cases", "complex diseases", "mediated 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 discover") OR ("communicable diseases"))) OR ((("communicated disease") OR ("complicated diseases")))).
• Removing quotes may allow a broader search: (((( communicate discover ) or ( communicable diseases ))) or ((( communicated disease ) or ( complicated diseases )))).
• Adding a wildcard symbol may retrieve word variants: (((("communicate discover") or ("communicable diseases"))) or ((("communicated disease") or ("complicated diseases"))))*.