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