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

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