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

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