Perhaps you should try some spelling variations:
hanh vai » hanh va, hanh tai, hanh van
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
tuc ban » thuc ban, truc ban, tuc dan
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet
van hac » van hoc, van ha, van hai
nang ma » tang ma, sang ma, nang cao
tu ban » thu ban, te ban
ma hoi » mai hoi, xa hoi, ma hoa

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 ky nang ma hoi. hieu van hac ((tuc ban) OR (tu ban)) ((hanh vai) OR (hanh vi)) cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ma hoi. hieu van hac ((tuc ban) OR (tu ban)) ((hanh vai) or (hanh vi)) cua tre~".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ma hoi. hieu van hac ((tuc ban) OR (tu ban)) ((hanh vai) or (hanh vi)) cua tre*.