Perhaps you should try some spelling variations:
chang john » change john, changed john, chang soon
khan syed » ahsan syed, shah syed, khan sher
john wong » john song, john bonn
han shen » khan sher, can she, han en
wong yue » wang yue, hong yu
yan fan » yang fan, yan clan, yan guan
wang » wing, wan, lang

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: wang yan fan ((han shen) or (khan syed)) chang john wong yue ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang yan fan ((han shen) OR (khan syed)) chang john wong yue ;*.