Perhaps you should try some spelling variations:
wang liang » wang yang
chang john » change john, changed john, chang soon
liang sun » liang dan, liang tan, wing sun
khan syed » ahsan syed, shah syed, khan sher
john wong » john song, john bonn
wong yue » wang yue, hong yu
van en » van den, van een, van es

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 sun ((van en) OR (khan syed)) chang john wong yue ;~.
• Adding a wildcard symbol may retrieve word variants: wang liang sun ((van en) or (khan syed)) chang john wong yue ;*.