Perhaps you should try some spelling variations:
zhang yunling » wang yanling, zhang yuqin, zhang guoping
friedman john » friedmann john, friedman born, friedman jed
der friedman » die friedman, fred friedman, _ friedman
john kong » john king, john song, john wong
kong star » kong sar
yang xi » yang yi, yang jui

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: ((zhang yunling) OR (zhang chunlin)) ((yang xi) OR (yang di)) der friedman john kong star ;~.
• Adding a wildcard symbol may retrieve word variants: ((zhang yunling) or (zhang chunlin)) ((yang xi) or (yang di)) der friedman john kong star ;*.