Perhaps you should try some spelling variations:
thanh tung » thanh cong
hieu xanh » chieu xanh, hieu manh, hieu nganh
tung gian » duong gian, nung giang, tuong giai
doc hieu » toc thieu, hoc thieu, hoc hien
cong tan » cong tac, cong thanh, cong ty
cong san » cong tac
toan tap » toan ban

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 - thanh tung gian trong ((cong tan) or (cong san)) toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - thanh tung gian trong ((cong tan) OR (cong san)) toan tap.
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - thanh tung gian trong ((cong tan) or (cong san)) toan tap*.