Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
hieu manh » hieu nganh, dieu hanh, hien hanh
hang nang » chang nang, hang nong, hang hang
cao hang » cao dang, cao tang, cao nang
cao bang » cao dang, cao tang, cao nang
cong tap » cuong tap, cong tac, cong tan
tap toan » tap doan, tap quan, bai toan
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 ((chieu xanh) or (hieu manh)) - hang nang ((cao hang) or (cao bang)) cong tap toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu xanh) OR (hieu manh)) - hang nang ((cao hang) OR (cao bang)) cong tap toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu xanh) or (hieu manh)) - hang nang ((cao hang) or (cao bang)) cong tap toan cao*.