Perhaps you should try some spelling variations:
cang thang » cong thanh, dang thanh
chieu xanh » chieu sach, chieu sang, chieu tinh
hieu manh » hieu nganh, dieu hanh, hien hanh
cua hang » cua dang, cua nhung, cua cong
cong tap » cuong tap, cong tac, cong tan
tap toan » tap doan, tap quan, bai toan
toan ban » van ban
ca hang » ca chang, va hang, ca tang

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