Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh van » thanh san, thanh toan, thanh phan
sach ky » sac ky, sach ty, sach kem
hieu va » lieu va, hieu qua
xuc ban » duc ban, cuc ban, quoc ban
su tien » su hien, tu tieng, dau tien
va cam » va cham, va cac, va cao
x hoi » xa hoi, o hoi, x ho
kien » bien, vien, dien

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach ky) or (sach y)) nang x hoi. hieu va cam xuc ban thanh van ((su tien) or (su kien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sach y)) nang x hoi. hieu va cam xuc ban thanh van ((su tien) OR (su kien)).
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) or (sach y)) nang x hoi. hieu va cam xuc ban thanh van ((su tien) or (su kien))*.