Perhaps you should try some spelling variations:
select patients » cleft patients, selecting patient, benefit patients
patients risk » patient risk, patients links, patients si
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
wang » wing, wan, lang

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: wang yan ((yang up) or (pang jun)) select patients risk tong shui ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang yan ((yang up) OR (pang jun)) select patients risk tong shui ;.
• Adding a wildcard symbol may retrieve word variants: wang yan ((yang up) or (pang jun)) select patients risk tong shui ;*.