Perhaps you should try some spelling variations:
dong hoang » hong hong
hoang wang » hong wang, hoang making
sang minh » kang minah, anh minh, song min
wang wei » zhang wei, wang zhi
yang jin » yang jun, ying jin, shang jin
yang jie » yang di, yang jui, yang xi
wong yue » wang yue, hong yu

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: dong hoang wang wei (rest OR west) ((sang minh) OR (((yang jin) OR (yang jie)))) wong yue ;~.
• Adding a wildcard symbol may retrieve word variants: dong hoang wang wei (rest or west) ((sang minh) or (((yang jin) or (yang jie)))) wong yue ;*.