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
san cau » van cau, ban cau, can 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 san 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 san cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu xanh) OR (chieu sach)) - hanh ((trung tuan) or (tran tuan)) dung duong thanh san cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu xanh) OR (chieu sach)) - hanh ((trung tuan) or (tran tuan)) dung duong thanh san cau*.