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 ((((((("communicated diseases") OR ("communicate discover"))) OR ("communicable disease"))) OR ("complicated diseases")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"communicable diseases\") or (((((((\"communicated diseases\") OR (\"communicate discover\"))) or (\"communicable disease\"))) or (\"complicated diseases\"))))".
• Removing quotes may allow a broader search: (( communicable diseases ) or ((((((( communicated diseases ) OR ( communicate discover ))) or ( communicable disease ))) or ( complicated diseases )))).
• Adding a wildcard symbol may retrieve word variants: (("communicable diseases") or ((((((("communicated diseases") OR ("communicate discover"))) or ("communicable disease"))) or ("complicated diseases"))))*.