Perhaps you should try some spelling variations:
van dinh » van minh, van dich, xuan dinh
su sach » so sach, vu sach
va dinh » va kinh, va tinh, vu dinh
cac tuc » cac toc, cac tu, cac tac
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
sach v » sach va, sach y, sach 2
me hoi » le hoi
v nang » va nang, vu nang, van nang
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 v nang ((me hoi) or (ma hoa)). hieu va cac tuc ((va dinh) or (van dinh)) ca cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach v nang ((me hoi) OR (ma hoa)). hieu va cac tuc ((va dinh) OR (van dinh)) ca cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach v nang ((me hoi) or (ma hoa)). hieu va cac tuc ((va dinh) or (van dinh)) ca cua tre*.