Perhaps you should try some spelling variations:
cost patients » cost patient, cleft patients, care patients
patients risk » patient risk, patients links, patients si
wing yanling » wang yanling, wang yangming
risk tong » risk among, risk along
tong shui » tong hui, cong shu, gong hui
tying up » taking up, tying _
pang jun » yang jui

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: wing yanling ((tying up) OR (pang jun)) cost patients risk tong shui ;~.
• Adding a wildcard symbol may retrieve word variants: wing yanling ((tying up) or (pang jun)) cost patients risk tong shui ;*.