Perhaps you should try some spelling variations:
cost patients » cleft patients, care patients, des patients
cost patient » cross patient, courts patient, class patient
hua guang » hua jiang, wu guang
guang end » guang eu
risk cong » risk coping, risk among, risk along
lang hua » wang hua, wang hui, dong hua

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "lang hua guang end ((cost patients) OR (cost patient)) risk cong shu ;~".
• Adding a wildcard symbol may retrieve word variants: lang hua guang end ((cost patients) OR (cost patient)) risk cong shu ;*.