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