Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
tieu sach » chieu sach, dien sach, te sach
trinh vat » trinh van, trinh luat, sinh vat
vat nhung » va nhung, vap nhung, vai nhung
cong bang » cuong bang, dong bang, hong bang
cong ban » cong san, cong tan, cong dan
than cau » phan cau, than cap, thanh chau
toan cau » toan cao, toan ban, toan tap

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: theo tieu sach - canh trinh vat nhung ((cong ban) OR (cong bang)) ((than cau) OR (toan cau))~.
• Adding a wildcard symbol may retrieve word variants: theo tieu sach - canh trinh vat nhung ((cong ban) or (cong bang)) ((than cau) or (toan cau))*.