Perhaps you should try some spelling variations:
van dinh » van minh, van dich, xuan dinh
su sach » so sach, vu sach
qua cac » cua cac
cac tac » cac toc, cac bac, cac dac
va dinh » va kinh, va tinh, vu dinh
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
me hoi » le hoi
ca cua » co cua

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 y nang ((me hoi) or (ma hoa)). hieu qua cac tac ((va dinh) or (van dinh)) ca cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang ((me hoi) OR (ma hoa)). hieu qua cac tac ((va dinh) OR (van dinh)) ca cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach y nang ((me hoi) or (ma hoa)). hieu qua cac tac ((va dinh) or (van dinh)) ca cua tre*.