Perhaps you should try some spelling variations:
dinh vai » dinh van, dinh vi, dinh va
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
cam duc » cam xuc, cao duc, pham duc
va dinh » van dinh, va kinh, va tinh
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao
x hoi » xa hoi, x ho, 5 hoi
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ky nang ((x hoi) OR (o hoi)). hieu va cam duc va dinh vai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky nang ((x hoi) OR (o hoi)). hieu va cam duc va dinh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: so sach ky nang ((x hoi) OR (o hoi)). hieu va cam duc va dinh vai cua tre*.