Perhaps you should try some spelling variations:
cleft patients » select patients, les patients, benefit patients
cost patients » cost patient, care patients, des patients
wang liang » wang yang
risk tong » risk among, risk along
tong shui » tong hui, cong shu, gong hui
pang jun » yang jui
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 liang ((yang up) OR (pang jun)) ((cost patients) OR (cleft patients)) risk tong shui ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang liang ((yang up) or (pang jun)) ((cost patients) OR (cleft patients)) risk tong shui ;~".
• Adding a wildcard symbol may retrieve word variants: wang liang ((yang up) or (pang jun)) ((cost patients) OR (cleft patients)) risk tong shui ;*.