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 yangming
risk tong » risk among, risk along
tong shui » tong hui, cong shu, gong hui
tying up » taking up, tying _
yang jin » yang jie, yang jun, ying jin

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) OR (wang yanling)) ((tying up) OR (yang jin)) cost patients risk tong shui ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((wing yanling) OR (wang yanling)) ((tying up) or (yang jin)) cost patients risk tong shui ;~".
• Adding a wildcard symbol may retrieve word variants: ((wing yanling) OR (wang yanling)) ((tying up) or (yang jin)) cost patients risk tong shui ;*.