Perhaps you should try some spelling variations:
ban hanh » ban hang
su sach » so sach, vu sach
cao xuc » cam xuc, cao duc, cao suc
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
sach ty » sach y, sach tu, sach thu
hieu va » lieu va
cao hoi » cau hoi, co hoi, cao hoc
ty nang » ky nang, ty xang, ty hang
cua tre » cua te, cuu tre, cua triet

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 ty nang cao hoi. ((hieu va) OR (hieu qua)) cao xuc ((va hanh) OR (ban hanh)) vai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang cao hoi. ((hieu va) OR (hieu qua)) cao xuc ((va hanh) or (ban hanh)) vai cua tre~".
• Adding a wildcard symbol may retrieve word variants: su sach ty nang cao hoi. ((hieu va) OR (hieu qua)) cao xuc ((va hanh) or (ban hanh)) vai cua tre*.