Perhaps you should try some spelling variations:
hieu xanh » chieu xanh, hieu manh, hieu nganh
hanh mang » nhanh mang, hanh trang, nhanh lang
doc hieu » toc thieu, hoc thieu, hoc hien
cong tac » cong ty
cong tan » cong san, cong thanh, cong ty
toan cau » toan cao, toan ban, toan tap
mang va » mang vua, hang va, bang va

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