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