Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
nhieu tang » chieu sang, hieu lang, nhiet nang
thanh tung » thanh cong
phung cong » nhung cong, phong cong, nhung chong
cac phung » cac phuong, cac chung, cac phong
tung cac » dung cac, vung cac, cung cac
van toan » van tan, van thanh, manh toan
van tuan » van quan, van ban, anh tuan

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

• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu sach) OR (nhieu tang)) - thanh tung cac phung cong ((van toan) OR (van tuan)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chieu sach) or (nhieu tang)) - thanh tung cac phung cong ((van toan) OR (van tuan)) cau~".
• Adding a wildcard symbol may retrieve word variants: doi ((chieu sach) or (nhieu tang)) - thanh tung cac phung cong ((van toan) OR (van tuan)) cau*.