Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu tinh, hieu manh
chieu sang » chieu sach, hieu lang, nhieu tang
thanh toan » thanh hoa, thanh san, tinh toan
tuan tong » thuan trong, toan thong, tuan duong
toan tong » toan thong, toan trong, toan cong
cong tan » cong tac, cong san, cong thanh
tan than » tan thanh, tan tran, ban than
than cau » toan cau, phan cau, than cap

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