Perhaps you should try some spelling variations:
chieu xanh » chieu sang, chieu tinh, hieu manh
chieu sach » chinh sach, chiet tach, chieu sang
thanh tung » thanh cong
tung tuan » trung tuan, hung tuan, quang tuan
tuan dong » tuan duong, quan dong, luan dong
dong cong » duong cong, dung cong, dang cong
tan toan » tan tran, van toan, dan toan
tap toan » tap doan, tap quan, bai toan

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