Perhaps you should try some spelling variations:
patients risk » patient risk, patients links, patients si
wang yang » wang yan, wang liang, wang yanling
risk tong » risk among, risk along
tong shui » tong hui, cong shu, gong hui
tying up » taking up, tying _
yang jun » pang jun, yang jin, yang judy
yang jui » yang judy, yang di, yang xi

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 yang ((tying up) OR (((yang jun) OR (yang jui)))) cancer patients risk tong shui ;~.
• Adding a wildcard symbol may retrieve word variants: wang yang ((tying up) or (((yang jun) or (yang jui)))) cancer patients risk tong shui ;*.