Perhaps you should try some spelling variations:
patients sex » patients self, patients per, patients si
patients en » patients per, patients _, patients 1
wang liang » wang yang
among shui » among sri, tong shui
yang jui » yang judy, yang di, yang xi
yang jun » pang jun, yang jin, yang judy

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 liang ((yang jui) OR (yang jun)) cancer ((patients sex) OR (patients en)) among shui ;~.
• Adding a wildcard symbol may retrieve word variants: wang liang ((yang jui) or (yang jun)) cancer ((patients sex) or (patients en)) among shui ;*.