Perhaps you should try some spelling variations:
"communicate diseases" » "communicate disabled", "communicate discover", "communicate messages"
"complicated diseases" » "complicated cases", "complex diseases", "mediated diseases"
"communicated disease" » "communicate state", "communicated vision"

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