Perhaps you should try some spelling variations:
dong hoang » hong hong
dong yang » wang yang, yang yang, dan yang
yang hua » wang hua, yang hui, ying hua
yang jui » yang judy, yang di, yang xi
seen yan » see yan, sun yan, seen a
can wong » can hong, can work, can win
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 yang) OR (dong hoang)) ((yang hua) OR (yang jui)) ((seen yan) OR (ren yan)) can wong yue ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((dong yang) or (dong hoang)) ((yang hua) or (yang jui)) ((seen yan) OR (ren yan)) can wong yue ;~".
• Adding a wildcard symbol may retrieve word variants: ((dong yang) or (dong hoang)) ((yang hua) or (yang jui)) ((seen yan) OR (ren yan)) can wong yue ;*.