Perhaps you should try some spelling variations:
patients risk » patient risk, patients links, patients si
cost patients » cost patient, cleft patients, care patients
tong shui » tong hui, cong shu
pang jun » yang jui
gong hui » tong hui, wang hui, gong si
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)) cost patients risk ((tong shui) OR (gong hui)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang yan ((yang up) OR (pang jun)) cost patients risk ((tong shui) OR (gong hui)) ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang yan ((yang up) or (pang jun)) cost patients risk ((tong shui) OR (gong hui)) ;*".