Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
truc ban » thuc ban, truc dan, truc van
thanh de » hanh de, thanh ve, thanh do
su sach » so sach, vu sach
bo sach » co sach, hoc sach
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
cua tre » cuu tre, cua triet, dua tren
ky cau » ky chau, ke cau
cua te » cua tu

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