Perhaps you should try some spelling variations:
thanh trung » thanh tung
hien hanh » dieu hanh
tang cong » tang cuong, trang cong, dang cong
hien anh » thien anh, dien anh, tien anh
trung ha » trung hoc, trung tam, trung cap
cong tan » cong tac, cong san, cong thanh
tan than » tan thanh, tan tran, ban than
than tap » toan tap, han tap, phan tap
ha tang » phap tang, cao tang, kho tang

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) OR (hien hanh)) - thanh trung ha tang cong tan than tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien anh) OR (hien hanh)) - thanh trung ha tang cong tan than tap".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien anh) OR (hien hanh)) - thanh trung ha tang cong tan than tap*.