Perhaps you should try some spelling variations:
hien hanh » dieu hanh
hanh hang » thanh hang, hang hang, hanh han
hang cong » dang cong, hang nong, thanh cong
bang cong » dang cong, bang song, dung cong
tien anh » tieng anh, tien manh, dien anh
dan than » dan chan, ban than, van than
than cao » toan cao, thai cao, 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 ((tien anh) or (hien hanh)) - hanh hang va ((hang cong) or (bang cong)) dan than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((tien anh) OR (hien hanh)) - hanh hang va ((hang cong) OR (bang cong)) dan than cao.
• Adding a wildcard symbol may retrieve word variants: hoc ((tien anh) or (hien hanh)) - hanh hang va ((hang cong) or (bang cong)) dan than cao*.