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 » dung cong, thong cong, hang cong
hanh tang » hanh trang, anh tang, hanh mang
cong van » cong vang, cong san, song van
van van » tan van, san van, van vat

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((chieu sach) or (chieu sang)) - ((hanh tang) or (canh tranh)) va nhung cong van van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sach) OR (chieu sang)) - ((hanh tang) OR (canh tranh)) va nhung cong van van ban.
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sach) or (chieu sang)) - ((hanh tang) or (canh tranh)) va nhung cong van van ban*.