Perhaps you should try some spelling variations:
communicated diseases » communicated disease, communicable diseases, communicate disabled
communicable disease » communicable diseases
complicated diseases » complicated cases, complex diseases
mediated diseases » related diseases, medical diseases, related disease
complicated case » complicated cases, complicated acute, complicated chapter

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 (communicable disease))\") or (((\"((complicated diseases) OR (complicated case))\") or (\"mediated diseases\"))))".
• The words AND, OR and NOT may confuse the search; try adding quotes: "\"((\\"((communicated diseases) or (communicable disease))\\") or (((\\"((complicated diseases) OR (complicated case))\\") or (\\"mediated diseases\\"))))\"".
• Removing quotes may allow a broader search: (( ((communicated diseases) or (communicable disease)) ) or ((( ((complicated diseases) OR (complicated case)) ) or ( mediated diseases )))).