Perhaps you should try some spelling variations:
dinh vai » dinh van, dinh vi, dinh va
van dinh » van minh, van dich, va dinh
te sach » toc sach
sach ky » sac ky, sach y, sach ty
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
van hoi » van hoc, van hoe, van loi
ky dang » ky nang, ky danh
va cam » va cham, va cac, va cai
va cao » va cac, va co, va dao
lo van » le van, vo van, so van

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky dang ((van hoi) OR (van hoa)). hieu ((va cam) or (va cao)) lo van dinh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky dang ((van hoi) OR (van hoa)). hieu ((va cam) OR (va cao)) lo van dinh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky dang ((van hoi) OR (van hoa)). hieu ((va cam) or (va cao)) lo van dinh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky dang ((van hoi) OR (van hoa)). hieu ((va cam) or (va cao)) lo van dinh vai cua tre*.