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