Perhaps you should try some spelling variations:
yong hoang » dong hoang, hong hong, kong hang
wang yong » wang yang, wang hyoung, wang yan
shang hai » shang kai, dang hai, chang ha
hoang sy » hoang vu
yang lin » yang jin, wang lin, yang liang
yang li » yang di, yang xi, yang yi
hong yu » wong yue

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 yong hoang sy ((yang lin) OR (yang li)) yi ((shang hai) OR (hong yu)) ;~.
• Adding a wildcard symbol may retrieve word variants: wang yong hoang sy ((yang lin) or (yang li)) yi ((shang hai) or (hong yu)) ;*.