The Vietnamese word for star is
sao

Translations for star and their definitions

sao	©
1. adv. why
Sao nó bảo không đến? - Why did he say he wouldn’t come?
2. adv. how
Sao tao biết được? - How should I know?
Sao làm được hay vậy? - How did you do that?
3. adv. what; what is it; what now
Sao?Sao trăng gì !? - Wut?The hell you mean, "wut"?
4. adv. whatever
Sao cũng được. - Whatever / Anything will do.
5. adj. problematic, bad
Có sao lắm không? - Is it very bad?
Không sao đâu. - No problem.
6. n. star (luminous celestial body)
7. n. asterisk
toán sao - an "asterisked" math problem (marked with an asterisk); a difficult math problem
8. n. star (celebrity)
9. n. star (actor)
10. v. (rarely used in isolation) to duplicate; to copy
11. v. (chiefly of medical ingredients) to dry with heat in a pan