Perhaps you should try some spelling variations:
thanh trung » thanh tung
hien hanh » dieu hanh
tien anh » tieng anh, tien manh, dien anh
tam tong » tam nong, tam song, tam thuong
tai tong » tai trong, tai cong, tai truong
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 tong) OR (tai tong)) 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 tong) OR (tai tong)) cong ban chan cap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien hanh) or (tien anh)) - thanh trung ((tam tong) OR (tai tong)) cong ban chan cap".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien hanh) or (tien anh)) - thanh trung ((tam tong) OR (tai tong)) cong ban chan cap*.