Perhaps you should try some spelling variations:
thanh trung » thanh tung
chiet tach » chieu sach
trung tham » trung tam, trung thanh, trung thang
tham nhung » thi nhung
hoc chiet » hoc thiet, hoc nhiet, hoc hien
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
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: hoc chiet tach - thanh trung tham nhung ((cong dan) or (cong san)) than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chiet tach - thanh trung tham nhung ((cong dan) OR (cong san)) than cau*.