Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hieu lang » chieu sang, hieu quang, nhieu tang
tranh cua » doanh cua, manh cua
hang cong » dang cong, hang nong, bang cong
cua hang » cua dang, cua nhung, cua cong
san tan » van tan, san van, san ten
san tay » ban tay, dan tay, han tay

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