Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
dang xay » dang van, van xay
thanh de » hanh de, thanh ve, thanh do
nuoc ban » nuoc san, quoc ban, buoc ban
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
su sach » vu sach
hieu ve » hieu va, hieu van
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
bo sach » co sach, hoc sach
so sach » so sanh, co sach, hoc sach
cua tre » cua te, cuu tre, cua triet
ve cac » va cac, vien cac
de cua » le cua, te cua, dieu cua

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