Perhaps you should try some spelling variations:
duong thanh » dong thanh, muong thanh, luong thanh
chieu xanh » chieu sang, chieu tinh, hieu manh
chieu sach » chinh sach, chiet tach, chieu sang
trung tuan » trung thanh, trung tam, truong thanh
dung duong » dung dong, dong duong, dung dung
tran tuan » tran xuan, tran quang, tran thanh
thanh can » thanh san, thanh van, thanh tan
can cau » van cau, ban cau, ca cau

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chieu xanh) or (chieu sach)) - hanh ((trung tuan) or (tran tuan)) dung duong thanh can cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu xanh) OR (chieu sach)) - hanh ((trung tuan) OR (tran tuan)) dung duong thanh can cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu xanh) or (chieu sach)) - hanh ((trung tuan) or (tran tuan)) dung duong thanh can cau*.