Perhaps you should try some spelling variations:
chieu sang » chieu sach, hieu lang, nhieu tang
chieu xanh » chieu sach, chieu tinh, hieu manh
thanh tung » thanh cong
tung tuan » trung tuan, hung tuan, quang tuan
trong dan » trong dang, trong san, trong tan
thong dan » thong van, tuong dan, thong den
tuan han » tuan hoan, luan han, tran han
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 sang) OR (chieu xanh)) - thanh tung tuan han ((trong dan) OR (thong dan)) than cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sang) OR (chieu xanh)) - thanh tung tuan han ((trong dan) or (thong dan)) than cau~".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sang) OR (chieu xanh)) - thanh tung tuan han ((trong dan) or (thong dan)) than cau*.