Perhaps you should try some spelling variations:
"communicated diseases" » "communicable diseases", "communicable disease", "communicate disabled", "communicable diseasess", "communicate states"
"communicated disease" » "communicable disease", "communicable diseases", "communicate state"
"complicated diseases" » "complicated cases", "mediated diseases", "complicated case"

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