Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
su sach » so sach, vu sach
vai cua » dai cua, hai cua, lai cua
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cuu tre, cua triet
ty nang » ky nang, ty xang, ty hang
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va
va nay » va ngay, va cay
o hoc » co hoc, mo hoc, so hoc

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty nang ((o hoc) or (xa hoi)). lieu va nay ((xuc va) or (luc va)) hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang ((o hoc) OR (xa hoi)). lieu va nay ((xuc va) OR (luc va)) hanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ty nang ((o hoc) or (xa hoi)). lieu va nay ((xuc va) or (luc va)) hanh vai cua tre*.