Perhaps you should try some spelling variations:
thanh trung » thanh tung
nhung cong » dung cong, hang cong, nhung don
thong cong » trong cong, tong cong, thong thong
hieu xanh » chieu xanh, hieu manh, hieu nganh
doc hieu » toc thieu, hoc thieu, hoc hien
trung ha » trung hoc, trung tam, trung cap
than cau » toan cau, than cap, thanh chau
phan cau » phan dau, phan cac, phan tu

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