Perhaps you should try some spelling variations:
les patients » des patients, older patients, aids patients
cost patient » cross patient, courts patient, class patient
wang wang » wang liang, wang yan, wang yong
wang yang » wang yan, wang liang, wang yanling
among who » among hr, wrong who
along who » along two, wrong who
yang dem » yang dean, yang di, yang d

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