Perhaps you should try some spelling variations:
cost patients » cost patient, cleft patients, care patients
patients risk » patient risk, patients links, patients si
wang liang » wang yang
risk along » risk among, ask along
along hui » along nhue, tong hui, gong hui
tying up » taking up, tying _
yang » lang

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: ((wang liang) OR (wang yanling)) ((tying up) OR (yang di)) cost patients risk along hui ;~.
• Adding a wildcard symbol may retrieve word variants: ((wang liang) or (wang yanling)) ((tying up) or (yang di)) cost patients risk along hui ;*.