Perhaps you should try some spelling variations:
chiet tach » chieu sach
hanh trang » thanh trung, canh tranh, hanh trinh
dung tuong » dung thuong, dung truong, dung trong
biet cach » bien canh, viet sach, bien cac
tuong tac » cong tac, luong tai, tuong lai
trang va » tran van, hang va
tac tran » tan tran, tac trai, tac tren
tran cau » tran chau, toan cau, ran cau
hieu ca » hieu cac, hieu cua, hieu va
va dung » van dung, va duong, vat dung

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 ((((biet cach) OR (chiet tach))) OR (hieu ca)) - hanh trang va dung tuong tac tran cau~.
• Adding a wildcard symbol may retrieve word variants: hoc ((((biet cach) or (chiet tach))) or (hieu ca)) - hanh trang va dung tuong tac tran cau*.