Perhaps you should try some spelling variations:
ban thanh » ban hang
ban hanh » ban hang
su sach » vu sach
cau luc » cau truc, cau phuc
cua tre » cua te, cuu tre, cua triet
hieu ke » hieu kem, chieu ke, hieu ky
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
so sach » so sanh, bo sach, co sach
ve cua » le cua, de cua, te cua
ke cau » ket cau

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: ((su sach) OR (so sach)) ky dang xa hoi. hieu ke cau luc ((ban thanh) OR (ban hanh)) ve cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sach)) ky dang xa hoi. hieu ke cau luc ((ban thanh) OR (ban hanh)) ve cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) ky dang xa hoi. hieu ke cau luc ((ban thanh) OR (ban hanh)) ve cua tre*.