Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu xanh
chieu sang » chieu xanh, hieu lang, nhieu tang
canh trinh » canh tranh, hanh trinh, canh tinh
nhung cong » dung cong, thong cong, hang cong
trinh van » trinh han, trinh quan, trinh toan
van nhung » van nhuong, va nhung, van hung
cong van » cong vang, cong san, song van
van chat » cao chat

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

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