Perhaps you should try some spelling variations:
nhieu tang » chieu sang, hieu lang, nhiet nang
chieu sach » chinh sach, chiet tach, chieu sang
cang thang » cong thanh, dang thanh
va thong » va phuong, he thong, va cong
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((nhieu tang) or (chieu sach)) - cang thang ((va thong) OR (va thuong)) cong san toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((nhieu tang) OR (chieu sach)) - cang thang ((va thong) OR (va thuong)) cong san toan cao*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((nhieu tang) or (chieu sach)) - cang thang ((va thong) OR (va thuong)) cong san toan cao*".