Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hanh trang » thanh trung, canh tranh, hanh trinh
nhung cong » dung cong, thong cong, hang cong
hieu cach » hieu cac, biet cach, dieu cac
trang va » tran van, hang va
cong tan » cong tac, cong san, cong thanh
tran cau » tran chau, toan cau, ran cau
hieu ca » hieu cac, hieu cua, hieu va

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))) OR (hieu ca)) - hanh trang va nhung cong tan tran cau~.
• Adding a wildcard symbol may retrieve word variants: hoc ((((hieu cach) or (chieu sach))) or (hieu ca)) - hanh trang va nhung cong tan tran cau*.