Perhaps you should try some spelling variations:
"complicated diseases" » "complicated cases", "complex diseases", "mediated diseases"
"communicated disease" » "communicable disease", "communicated vision"
"communicate state" » "communicate strategy", "communicating state", "communication state"

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