Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
hieu xanh » chieu xanh, hieu manh, hieu nganh
cua thong » cua thuong, cua khong, cua tong
cong toan » cong tan, cong hoan, cong tuan
toan phan » thanh phan, hoa phan, luan phan
doc hieu » toc thieu, hoc thieu, hoc hien
toan ban » van ban
phan cau » phan dau, phan cac, phan tu
can ban » van ban

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 - ((can ban) or (toan ban)) cua thong cong toan phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - ((can ban) OR (toan ban)) cua thong cong toan phan cau.
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - ((can ban) or (toan ban)) cua thong cong toan phan cau*.