Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sach » chinh sach, chiet tach, chieu sang
hieu cach » hieu cac, hieu ca, biet cach
trung cua » truong cua, trung tuan, trung cap
dang cong » dung cong
hang nong » thang long, han tong
dan can » dan chan, dan canh, dan ca
can cau » van cau, ban cau, ca cau

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 ((hieu cach) OR (chieu sach)) - thanh trung cua ((dang cong) OR (hang nong)) dan can cau~.
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu cach) or (chieu sach)) - thanh trung cua ((dang cong) or (hang nong)) dan can cau*.