Perhaps you should try some spelling variations:
dinh day » dinh dat, dinh dao, dinh da
van dinh » van minh, van dich, va dinh
chuc van » chu van, chuc va, thuc van
su sach » so sach, vu sach
day cua » dai cua
cua tre » cua te, cuu tre, cua triet
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
te sach » toc sach
va cau » van cau, va cac, va dau
ve cau » ke cau, ve cac, le cau

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) or (te sach)) ky tang xa hoi. hieu ((ve cau) OR (va cau)) chuc van dinh day cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (te sach)) ky tang xa hoi. hieu ((ve cau) OR (va cau)) chuc van dinh day cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (te sach)) ky tang xa hoi. hieu ((ve cau) OR (va cau)) chuc van dinh day cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (te sach)) ky tang xa hoi. hieu ((ve cau) OR (va cau)) chuc van dinh day cua tre*.