Perhaps you should try some spelling variations:
class patient » cross patient, access patient, class latin
patient stays » patient study, patient als, patient meals
stays among » status among
among sex » among smes, among eu
tying up » taking up, tying _
yang jun » yang jui, pang jun, yang jin
wang » wing, wan, lang

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

• Performing a fuzzy search may retrieve terms with similar spellings: wang yanling ((tying up) or (yang jun)) class patient stays among sex ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang yanling ((tying up) OR (yang jun)) class patient stays among sex ;*.