Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
nhanh hang » nhanh thang, nhanh lang, thanh hang
hang cuong » tang cuong, hang cong, hang cung
cuong tap » luong tap, cong tac, luong tai
tap toan » tap doan, tap quan, bai toan
toan ban » van ban
va hang » van hang, va nang, va lang

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((chieu sach) or (dieu hanh)) - nhanh hang va hang cuong tap toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu sach) OR (dieu hanh)) - nhanh hang va hang cuong tap toan ban*.