Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hien sach » dien sach, thien hach, chieu sach
kien sach » dien sach, vien bach, kien mac
canh tran » canh tranh, hanh trang, banh trang
van nhung » van nhuong, va nhung, van hung
tran van » luan van
cong ban » cong bang, cong san, cong tan
ban than » ban thanh, van thanh, ban hang
than cau » toan cau, phan cau, than cap

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 ((hien sach) OR (kien sach)) - canh tran van nhung cong ban than cau~.
• Adding a wildcard symbol may retrieve word variants: hoc ((hien sach) or (kien sach)) - canh tran van nhung cong ban than cau*.