Perhaps you should try some spelling variations:
thanh trung » thanh tung
khoan viet » hoa viet, thon viet, han viet
khoa viet » hoa viet, thoai viet, hoc viet
trung cua » truong cua, trung tuan, trung cap
cua thong » cua thuong, cua khong, cua tong
cong dan » cong san, huong dan, cong dong
cong tan » cong tac, cong san, cong thanh
than cau » toan cau, phan cau, than cap

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((khoa viet) OR (khoan viet)) tach - thanh trung cua thong ((cong dan) or (cong tan)) than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((khoa viet) OR (khoan viet)) tach - thanh trung cua thong ((cong dan) OR (cong tan)) than cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((khoa viet) OR (khoan viet)) tach - thanh trung cua thong ((cong dan) or (cong tan)) than cau".
• Adding a wildcard symbol may retrieve word variants: ((khoa viet) OR (khoan viet)) tach - thanh trung cua thong ((cong dan) or (cong tan)) than cau*.