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