Perhaps you should try some spelling variations:
sach hay » sach han, sach ha, sach nay
hanh vai » hanh vi, hanh va, hanh tai
van hanh » van thanh, ban hanh, van anh
cham hoc » cham soc, chat hoc, cham hoi
vai cua » dai cua, hai cua, lai cua
hoc van » hoc dan, hoc va, hoc vat
va cham » va chat, va tham
hieu va » lieu va, hieu qua
xang xa » lang xa, mang xa, ang xa
sach tu » sach thu, cach tu, sach ty
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 hay) or (sach y))) or (sach tu)) xang xa hoi. hieu va cham hoc van hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((((sach hay) OR (sach y))) OR (sach tu)) xang xa hoi. hieu va cham hoc van hanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu ((((sach hay) or (sach y))) or (sach tu)) xang xa hoi. hieu va cham hoc van hanh vai cua tre*.