Perhaps you should try some spelling variations:
wang liang » wang yang
chang john » change john, changed john, chang won
chang soon » chang won, chin soon, chang gordon
liang sun » liang dan, liang tan, wing sun
khan syed » ahsan syed, shah syed, khan sher
wong yue » wang yue, hong yu
han en » han men, van en, chan eng

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 ((han en) OR (khan syed)) ((chang john) OR (chang soon)) wong yue ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang liang sun ((han en) or (khan syed)) ((chang john) OR (chang soon)) wong yue ;~".
• Adding a wildcard symbol may retrieve word variants: wang liang sun ((han en) or (khan syed)) ((chang john) OR (chang soon)) wong yue ;*.