Perhaps you should try some spelling variations:
ban thanh » ban hanh
ban hang » ngan hang
tu sach » thu sach, su sach, te sach
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
cay dua » chay dua, cay lua, cay nua
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
ca dua » ca cua, ca da, ca lua
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang x hoi. hieu va ((ca dua) or (cay dua)) ((ban thanh) or (ban hang)) vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang x hoi. hieu va ((ca dua) OR (cay dua)) ((ban thanh) OR (ban hang)) vai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x hoi. hieu va ((ca dua) or (cay dua)) ((ban thanh) or (ban hang)) vai cua tre*.