Perhaps you should try some spelling variations:
hieu manh » chieu xanh, hieu nganh, dieu hanh
hieu lang » chieu sang, hieu quang, nhieu tang
hang ban » hang luan, hang va, hang tai
qua dung » quang dung, su dung, qua song
cong van » cong vang, song van, cong tan
cong san » cong tac
toan ban » van ban
ban qua » ban quan, ban cua, ban sua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hieu manh) or (hieu lang)) - hang ban qua dung ((cong van) OR (cong san)) toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (hieu lang)) - hang ban qua dung ((cong van) OR (cong san)) toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu manh) or (hieu lang)) - hang ban qua dung ((cong van) OR (cong san)) toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) or (hieu lang)) - hang ban qua dung ((cong van) OR (cong san)) toan ban*.