Perhaps you should try some spelling variations:
hieu manh » chieu xanh, hieu nganh, dieu hanh
hieu lang » chieu sang, hieu quang, nhieu tang
dung cong » dung trong
hang ban » hang luan, hang va, hang tai
cua dung » cua dang, cua dong, qua dung
dan toan » van toan, manh toan, xuan toan
dan than » dan chan, ban than, van than
ban cua » ban quan

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