Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
hieu va » lieu va
cao xuc » cam xuc, cao duc, cao suc
va hanh » van hanh, va thanh, va danh
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 tang xa hoi. ((hieu va) or (hieu qua)) cao xuc ((va hanh) or (ban thanh)) dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky tang xa hoi. ((hieu va) OR (hieu qua)) cao xuc ((va hanh) OR (ban thanh)) dai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky tang xa hoi. ((hieu va) or (hieu qua)) cao xuc ((va hanh) or (ban thanh)) dai cua tre*.