Perhaps you should try some spelling variations:
hien sach » dien sach, kien sach, thien hach
cua thong » cua thuong, cua khong, cua tong
hua khong » hoa khong, cua khong, hoac khong
tan nhung » tang nhung, ban nhung, san nhung
nhung cau » chung cu, nhung bai, nhu cau
cong tan » cong tac, cong san, cong thanh

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 - canh tranh ((cua thong) OR (hua khong)) cong tan nhung cau~.
• Adding a wildcard symbol may retrieve word variants: hoc hien sach - canh tranh ((cua thong) or (hua khong)) cong tan nhung cau*.