Perhaps you should try some spelling variations:
among letters » among lecturers, among learners, among masters
patients per » patients en, patients _, patients 1
patients eu » patients en, patients eat, patients _
wang yang » wang yan, wang liang, wang yanling
yang can » yang dean, yang yang, yang jin
yang fan » zhang fan, yang dean, yang yang

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