Perhaps you should try some spelling variations:
duong thanh » dong thanh, muong thanh, luong thanh
chieu xanh » chieu sach, chieu tinh, hieu manh
chieu sang » chieu sach, hieu lang, nhieu tang
trung tuan » trung thanh, trung tam, tran tuan
nong duong » dong duong, cong duong, song duong
thanh toan » thanh hoa, thanh san, tinh toan
trung cua » truong cua, trung cap, dung cua
toan cao » toan ban, toan tap

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 ((trung cua) OR (trung tuan)) nong duong thanh toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu xanh) or (chieu sang)) - thanh ((trung cua) OR (trung tuan)) nong duong thanh toan cao~".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu xanh) or (chieu sang)) - thanh ((trung cua) OR (trung tuan)) nong duong thanh toan cao*.