Perhaps you should try some spelling variations:
chiet tach » chieu sach
trung tuan » trung thanh, trung tam, tran tuan
hoc chiet » hoc thiet, hoc nhiet, hoc hien
trung cap » truong cao, trung tam
dung cong » dung trong
thanh cau » thanh chau, thanh mau, thanh ca
nhanh cau » nhanh cay, thanh chau, nhanh ha
cong van » cong vang, cong san, song van

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 chiet tach - thanh ((trung tuan) OR (trung cap)) dung cong van ((thanh cau) OR (nhanh cau))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chiet tach - thanh ((trung tuan) or (trung cap)) dung cong van ((thanh cau) OR (nhanh cau))~".
• Adding a wildcard symbol may retrieve word variants: hoc chiet tach - thanh ((trung tuan) or (trung cap)) dung cong van ((thanh cau) OR (nhanh cau))*.