Perhaps you should try some spelling variations:
patients death » patients eat, patients search, patients treated
patients near » patients per, patients eat, patients search
among letters » among lecturers, among learners, among masters
wang liang » wang yang
yang yang » wang yang, wang yan
yang can » yang fan, yang dean, 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 liang ((yang can) or (yang yang)) care ((patients death) OR (patients near)) among letters ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang liang ((yang can) OR (yang yang)) care ((patients death) OR (patients near)) among letters ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang liang ((yang can) or (yang yang)) care ((patients death) OR (patients near)) among letters ;*".