Perhaps you should try some spelling variations:
patients 1.8 » patients 10.1, patients 10.5, patients 10.6
among actors » among doctors, among acholi, among donors
de patients » des patients, do patients, de pacientes
yang yang » wang yang, wang yan
1.8 among » 1.5 among, 19 among, 1 among
yan yang » yao yang, tan yang, yan wang
dan yang » daun yang, tan yang, wang yang
fan de » van de, aan 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: wai ((((yan yang) OR (yang yang))) OR (dan yang)) fan de patients 1.8 among actors ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wai ((((yan yang) OR (yang yang))) or (dan yang)) fan de patients 1.8 among actors ;~".
• Adding a wildcard symbol may retrieve word variants: wai ((((yan yang) OR (yang yang))) or (dan yang)) fan de patients 1.8 among actors ;*.