Perhaps you should try some spelling variations:
cang thang » cong thanh, dang thanh
chieu sach » chinh sach, chiet tach, chieu sang
hieu manh » chieu xanh, hieu nganh, dieu 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 sach) 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 sach) OR (hieu manh)) - cang thang ((ca hang) OR (cua hang)) cong tap toan ban.
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) or (hieu manh)) - cang thang ((ca hang) or (cua hang)) cong tap toan ban*.