Perhaps you should try some spelling variations:
patients risk » patient risk, patients links, patients view
patients si » patients _, patients 1, patients en
among east » among breast, among ers, among health
yang yang » wang yang, wang yan
yang jun » yang jui, pang jun, yang jin
wang » wing, wan, 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 yanling ((yang jun) OR (yang yang)) burned ((patients risk) OR (patients si)) among east ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang yanling ((yang jun) or (yang yang)) burned ((patients risk) OR (patients si)) among east ;~".
• Adding a wildcard symbol may retrieve word variants: wang yanling ((yang jun) or (yang yang)) burned ((patients risk) OR (patients si)) among east ;*.