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

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 cam xuc ((((va hanh) OR (ban hanh))) OR (van 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 cam xuc ((((va hanh) OR (ban hanh))) or (van hanh)) vai cua tre~".
• Adding a wildcard symbol may retrieve word variants: su sach ty nang cao hoi. hieu va cam xuc ((((va hanh) OR (ban hanh))) or (van hanh)) vai cua tre*.