Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hieu xanh » chieu xanh, hieu manh, hieu nganh
trung cua » truong cua, trung tuan, trung cap
doc hieu » toc thieu, hoc thieu, hoc hien
tang cua » mang cua, hang cua, tang luan
cong san » cong tac
than cau » toan cau, phan cau, than cap
phan dau » phan tu, hang dau

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