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"))))*.