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