Perhaps you should try some spelling variations:
among masters » among partners, among farmers, among actors
patients 1 » patients _
yang yang » wang yang, wang yan
yan yang » yao yang, dan yang, tan yang
van den » van der, van de
1 among » 19 among, 1.5 among, 1.8 among
aan de » van de, jan de

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: lang ((yan yang) OR (yang yang)) ((aan de) OR (van den)) patients 1 among masters ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "lang ((yan yang) OR (yang yang)) ((aan de) or (van den)) patients 1 among masters ;~".
• Adding a wildcard symbol may retrieve word variants: lang ((yan yang) OR (yang yang)) ((aan de) or (van den)) patients 1 among masters ;*.