Perhaps you should try some spelling variations:
close patients » les patients, cleft patients, obese patients
care patients » cancer patients, failure patients
among letters » among lecturers, among learners, among masters
wang liang » wang yang
yang yang » wang yang, wang yan
yang fan » zhang fan, yang dean, yang jin
en among » en amont, eu among, even among

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)) ((close patients) OR (care patients)) en among letters ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang liang ((yang fan) OR (yang yang)) ((close patients) OR (care patients)) en among letters ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang liang ((yang fan) or (yang yang)) ((close patients) OR (care patients)) en among letters ;*".