Perhaps you should try some spelling variations:
patients si » patients _, patients 1, patients 2
patients en » patients per, patients _, patients 1
among users » among ers, among peers, 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)) lose ((patients si) or (patients en)) among users ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang liang ((yang can) OR (yang yang)) lose ((patients si) OR (patients en)) among users ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang liang ((yang can) OR (yang yang)) lose ((patients si) or (patients en)) among users ;*".