Perhaps you should try some spelling variations:
cleft patients » select patients, benefit patients
les patients » des patients, older patients, aids patients
wang liang » wang yang
liang yang » liang ying, wang yang, yang yang
among who » along who, among hr, wrong who
yang dem » yang dean, yang di, yang d

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 dem ((cleft patients) or (les patients)) risk among who ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang liang yang dem ((cleft patients) OR (les patients)) risk among who ;*.