Perhaps you should try some spelling variations:
long thanh » luong thanh, long han, long trinh
tang ching » hang china, tang chun, tang chinese
tang zheng » wang zheng, fang sheng, fang zhen
zhen yong » chen yong, zheng rong, zheng cong
kim song » kim young, kim eung
song hui » tong hui, gong hui, sng hui

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

• Performing a fuzzy search may retrieve terms with similar spellings: long thanh ((tang ching) or (tang zheng)) zhen yong kim song hui ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: long thanh ((tang ching) OR (tang zheng)) zhen yong kim song hui ;.
• Adding a wildcard symbol may retrieve word variants: long thanh ((tang ching) or (tang zheng)) zhen yong kim song hui ;*.