Perhaps you should try some spelling variations:
cost patients » cleft patients, care patients, des patients
cost patient » cross patient, courts patient, class patient
wang yang » wang yan, wang liang, wang yanling
risk tong » risk among, risk along
yang jin » yang jie, yang jun, ying jin
tong hui » wang hui
yang up » yang jui, tying up, yang jun

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: wang yang ((yang up) OR (yang jin)) ((cost patients) OR (cost patient)) risk tong hui ;~.
• Adding a wildcard symbol may retrieve word variants: wang yang ((yang up) or (yang jin)) ((cost patients) or (cost patient)) risk tong hui ;*.