Perhaps you should try some spelling variations:
cleft patients » select patients, les patients, benefit patients
cost patients » cost patient, care patients, des patients
guang end » guang eu
risk cong » risk coping, risk among, risk along
lang hua » wang hua, dong hua, gang hu
wang hui » wang hua, wang zhi, wang wei

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((lang hua) OR (wang hui)) guang end ((cost patients) OR (cleft patients)) risk cong shu ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((lang hua) OR (wang hui)) guang end ((cost patients) or (cleft patients)) risk cong shu ;~".
• Adding a wildcard symbol may retrieve word variants: ((lang hua) OR (wang hui)) guang end ((cost patients) or (cleft patients)) risk cong shu ;*.