Perhaps you should try some spelling variations:
hieu xanh » chieu xanh, hieu manh, hieu nganh
trang vap » trang vai, trang van, tran van
hang cong » dang cong, hang nong, bang cong
doc hieu » toc thieu, hoc thieu, hoc hien
trang va » tran van, hang va
cong tac » cong ty
tac tran » tan tran, tac trai, tac tren
tran cao » toan cao, tran chau, trang cho

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu xanh - manh ((trang vap) or (trang va)) hang cong tac tran cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - manh ((trang vap) OR (trang va)) hang cong tac tran cao.
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - manh ((trang vap) or (trang va)) hang cong tac tran cao*.