Perhaps you should try some spelling variations:
care patients » cancer patients, failure patients
patients risk » patient risk, patients links, patients si
wing yanling » wang yanling, wang yangming
risk tong » risk among, risk along
tying up » taking up, tying _
yang jin » yang jie, yang jun, ying jin
tong hui » wang hui

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 (yang jin)) care patients risk tong hui ;~.
• Adding a wildcard symbol may retrieve word variants: wing yanling ((tying up) or (yang jin)) care patients risk tong hui ;*.