Perhaps you should try some spelling variations:
doing hoang » dong hoang
huang jing » huang ying, wang jing, huang bin
huang ting » huang ying, huang bin, huang lin
sang minh » kang minah, anh minh, song min
yale yu » yale nus
yu chen » yu cheng, yi chen, yulu chen
hong yu » wong yue

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

• Performing a fuzzy search may retrieve terms with similar spellings: doing hoang yale yu chen ((sang minh) or (((huang jing) or (huang ting)))) hong yu ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doing hoang yale yu chen ((sang minh) OR (((huang jing) OR (huang ting)))) hong yu ;.
• Adding a wildcard symbol may retrieve word variants: doing hoang yale yu chen ((sang minh) or (((huang jing) or (huang ting)))) hong yu ;*.