Perhaps you should try some spelling variations:
thanh trung » thanh tung
hien anh » hien hanh, thien anh, dien anh
trung ha » trung hoc, trung tam, trung cap
ha thong » hoa thong, nha thong, he thong
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien anh - thanh trung ha thong ((cong dan) or (cong san)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien anh - thanh trung ha thong ((cong dan) OR (cong san)) toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc hien anh - thanh trung ha thong ((cong dan) or (cong san)) toan cao*.