Perhaps you should try some spelling variations:
thanh trung » thanh tung
hieu xanh » chieu xanh, hieu manh, hieu nganh
trung cua » truong cua, trung tuan, trung cap
cua thong » cua thuong, cua khong, cua tong
doc hieu » toc thieu, hoc thieu, hoc hien
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
phan cau » phan dau, phan tu, phan lap
phan cac » nhan cach, phan dau, phan lap

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 cua thong ((cong dan) OR (cong san)) ((phan cau) or (phan cac))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - thanh trung cua thong ((cong dan) OR (cong san)) ((phan cau) OR (phan cac))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu xanh - thanh trung cua thong ((cong dan) OR (cong san)) ((phan cau) or (phan cac))*".