Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
su sach » vu sach
doi cua » dai cua, hoi cua
luc ban » duc ban, cuc ban, luc bat
cau luc » cau truc, cau phuc
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
so sach » so sanh, bo sach, co sach
do cua » co cua, de cua, dong cua
ky cau » ky chau, ke 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 ky cau luc ban thanh ((do cua) OR (doi 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 ky cau luc ban thanh ((do cua) OR (doi cua)) tre~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) ky dang xa hoi. hieu ky cau luc ban thanh ((do cua) OR (doi cua)) tre*.