Perhaps you should try some spelling variations:
cleft patients » select patients, les patients, benefit patients
patients risk » patient risk, patients links, patients si
wang yang » wang yan, wang liang, wang yanling
risk cong » risk coping, risk among, risk along
yang jun » yang jui, pang jun, yang jin
yang up » yang jui, tying up, hang ups

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 up) or (yang jun)) cleft patients risk cong shu ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang yang ((yang up) OR (yang jun)) cleft patients risk cong shu ;.
• Adding a wildcard symbol may retrieve word variants: wang yang ((yang up) or (yang jun)) cleft patients risk cong shu ;*.