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
va duong » van duong, va tuong, va huong
cong ban » cong bang, cong san, cong tan
than cau » toan cau, phan cau, than cap
khan cap » khan ap, than cap, khoan cam
va dung » van dung, vat dung, va ung

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