Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu xanh
chieu sang » chieu xanh, hieu lang, nhieu tang
nhung cong » thong cong, hang cong, nhung don
tranh cua » doanh cua, manh cua
dung cong » dung trong
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 ((chieu sach) or (chieu sang)) - canh tranh cua ((nhung cong) OR (dung cong)) dan toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (chieu sang)) - canh tranh cua ((nhung cong) OR (dung cong)) dan toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sach) or (chieu sang)) - canh tranh cua ((nhung cong) OR (dung cong)) dan toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) or (chieu sang)) - canh tranh cua ((nhung cong) OR (dung cong)) dan toan ban*.