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