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