Perhaps you should try some spelling variations:
nhanh thai » nhanh thi, nhanh thanh, nhanh thang
hanh thai » hinh thai, hanh tai, anh thai
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
xuc van » luc van, vuc van, xuc ban
duc van » duc va, duc tan, duc manh
sach ky » sac ky, sach y, sach ty
van cac » van hac, van cau, van bac
cua tre » cua te, cuu tre, cua triet
nang o » nang co, nang ho, nang ro
o hai » co hai, so hai, o lai

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 ky nang o hai. hieu van cac ((xuc van) or (duc van)) ((hanh thai) or (nhanh thai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang o hai. hieu van cac ((xuc van) OR (duc van)) ((hanh thai) OR (nhanh thai)) cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang o hai. hieu van cac ((xuc van) or (duc van)) ((hanh thai) or (nhanh thai)) cua tre*.