Perhaps you should try some spelling variations:
thanh trung » thanh tung
hien hanh » dieu hanh
cong cong » cong dong, trong cong, dung cong
tien anh » tieng anh, tien manh, dien anh
tam cong » dam cong, tam nong, tam song
cong ban » cong bang, cong san, cong tan
ban chan » dan chan, ban than, ban nhan
chan cap » khan cap, than cap, cao 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 ((hien hanh) or (tien anh)) - thanh trung tam cong cong ban chan cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien hanh) OR (tien anh)) - thanh trung tam cong cong ban chan cap.
• Adding a wildcard symbol may retrieve word variants: hoc ((hien hanh) or (tien anh)) - thanh trung tam cong cong ban chan cap*.