Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
tien thanh » tien thinh, tran thanh, den thanh
hanh tranh » canh tranh, hanh trinh, hanh trang
tranh chap » tranh cua, trinh chat
chap nhung » chap thuong, cua nhung, tham nhung
nhung cong » dung cong, thong cong, hang cong
cong ban » cong bang, cong san, cong tan
khan cap » khan ap, khoan cam, phan cac
than cap » thanh lap, thanh cac, than cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thieu sach) or (tien thanh)) - hanh tranh chap nhung cong ban ((khan cap) or (than cap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sach) OR (tien thanh)) - hanh tranh chap nhung cong ban ((khan cap) OR (than cap)).
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sach) or (tien thanh)) - hanh tranh chap nhung cong ban ((khan cap) or (than cap))*.