Perhaps you should try some spelling variations:
cleft patients » select patients, les patients, benefit patients
close patients » care patients, les patients, obese patients
among letters » among lecturers, among learners, among masters
wang liang » wang yang
yang fan » zhang fan, yang dean, yang yang
eu among » bu among, euro among, era 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 (wang yan)) ((close patients) OR (cleft patients)) eu among letters ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang liang ((yang fan) OR (wang yan)) ((close patients) OR (cleft patients)) eu among letters ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang liang ((yang fan) or (wang yan)) ((close patients) OR (cleft patients)) eu among letters ;*".