Perhaps you should try some spelling variations:
ban thanh » ban hanh
ban hang » ngan hang
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
cay dua » cay lua, ca dua, cay nua
hai cua » thai cua, dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet

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 xa hoi. hieu ve ((chay dua) or (cay dua)) ((ban thanh) or (ban hang)) hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. hieu ve ((chay dua) OR (cay dua)) ((ban thanh) OR (ban hang)) hai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. hieu ve ((chay dua) or (cay dua)) ((ban thanh) or (ban hang)) hai cua tre*.