Perhaps you should try some spelling variations:
among patients » among nations
bond patients » burned patients, bond ratings, bat patients
among east » among breast, among ers, among health
wang yang » wang yan, wang liang, wang yanling
yang yang » wang yan
yang jun » yang jui, pang jun, yang jin

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: wang yang ((yang jun) or (yang yang)) ((bond patients) OR (among patients)) risk among east ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang yang ((yang jun) OR (yang yang)) ((bond patients) OR (among patients)) risk among east ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang yang ((yang jun) or (yang yang)) ((bond patients) OR (among patients)) risk among east ;*".