Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu xanh
chieu sang » chieu xanh, hieu lang, nhieu tang
thanh toan » thanh hoa, thanh san, tinh toan
toan tuan » tran tuan, toan quan, doan tuan
tuan tong » toan tong, thuan trong, toan thong
tong cong » trong cong, cong cong, dung cong
tan than » tan thanh, ban than, tam than

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: hoc ((chieu sach) OR (chieu sang)) - thanh toan tuan tong cong ((tan than) OR (tan tran)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sach) or (chieu sang)) - thanh toan tuan tong cong ((tan than) OR (tan tran)) cau~".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) or (chieu sang)) - thanh toan tuan tong cong ((tan than) OR (tan tran)) cau*.