Perhaps you should try some spelling variations:
among parents » among patients, among ports
patient 2.5 » patient 2.1, patient 2.7, patient 2.8
her patient » der patient, der patienten, older patient
yang yang » wang yang, wang yan
2.5 among » 2.15 among, 1.5 among, 1.8 among
yan yang » dan yang, tan yang, yan wang
van her » van der, van het, van eerd
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) OR (yang yang))) OR (yao yang)) van her patient 2.5 among parents ;~.
• Adding a wildcard symbol may retrieve word variants: wang ((((yan yang) or (yang yang))) or (yao yang)) van her patient 2.5 among parents ;*.