Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
va nang » van nang, da nang, cam nang
va hanh » van hanh, va thanh, va danh
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
y nang » ly nang, v nang, may nang
luc va » duc va, tuc va, loc va
x hoi » xa hoi, o hoi, x ho

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 ((y nang) or (ky nang)) x hoi. hieu va nang luc va hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((y nang) OR (ky nang)) x hoi. hieu va nang luc va hanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ((y nang) or (ky nang)) x hoi. hieu va nang luc va hanh vai cua tre*.