Perhaps you should try some spelling variations:
kang minah » sang minh
dong hoang » hong hong
dong sign » dong sin, among sign, dong bin
yang minh » sang minh, yang mind, anh minh
cong hai » hong hai, dang hai, cong van
ya a » a a, y a, ye a
test » text, west, best

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((dong hoang) or (dong sign)) ya a test ((yang minh) or (kang minah)) cong hai ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((dong hoang) OR (dong sign)) ya a test ((yang minh) OR (kang minah)) cong hai ;.
• Adding a wildcard symbol may retrieve word variants: ((dong hoang) or (dong sign)) ya a test ((yang minh) or (kang minah)) cong hai ;*.