Perhaps you should try some spelling variations:
patients risk » patient risk, patients links, patients si
cost patients » cost patient, cleft patients, care patients
wang yang » wang yan, wang yanling
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.

• Performing a fuzzy search may retrieve terms with similar spellings: ((wang yang) OR (wang liang)) ((yang up) or (pang jun)) cost patients risk tong shui ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((wang yang) OR (wang liang)) ((yang up) OR (pang jun)) cost patients risk tong shui ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((wang yang) OR (wang liang)) ((yang up) or (pang jun)) cost patients risk tong shui ;".
• Adding a wildcard symbol may retrieve word variants: ((wang yang) OR (wang liang)) ((yang up) or (pang jun)) cost patients risk tong shui ;*.