Perhaps you should try some spelling variations:
cost patient » cross patient, courts patient, class patient
les patients » des patients, older patients, aids patients
wrong who » wrong why, wrong what, wrong when
along two » among two, along who
yan yang » yang yang, yao yang, dan yang
yang dem » yang dean, yang di, yang d
wang » wing, wan, lang

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: wang yan yang dem ((cost patient) OR (les patients)) risk ((wrong who) OR (along two)) ;~.
• Adding a wildcard symbol may retrieve word variants: wang yan yang dem ((cost patient) or (les patients)) risk ((wrong who) or (along two)) ;*.