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