Perhaps you should try some spelling variations:
thanh trung » thanh tung
hieu xanh » chieu xanh, hieu manh, hieu nganh
doc hieu » toc thieu, hoc thieu, hoc hien
tam dung » tam duong, tac dung, tan dung
cong tan » cong san, cong thanh, cong ty
cong tac » cong ty
toan cau » toan cao, toan ban, toan tap

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 trung tam dung ((cong tan) or (cong tac)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - thanh trung tam dung ((cong tan) OR (cong tac)) toan cau.
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - thanh trung tam dung ((cong tan) or (cong tac)) toan cau*.