Perhaps you should try some spelling variations:
among masters » among partners, among farmers, among letters
patients 1.8 » patients 10.1, patients 10.5, patients 10.6
among actors » among doctors, among acholi, among donors
yan yang » yang yang, yao yang, dan yang
aan de » jan de
van de » van der, van den
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 ((aan de) OR (van de)) patients 1.8 ((among masters) OR (among actors)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang yan yang ((aan de) or (van de)) patients 1.8 ((among masters) OR (among actors)) ;~".
• Adding a wildcard symbol may retrieve word variants: wang yan yang ((aan de) or (van de)) patients 1.8 ((among masters) OR (among actors)) ;*.