Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
cau chuc » cau chu, cau phuc, canh chuc
chuc van » chu van, chuc va, thuc van
van dinh » van minh, van dich, va dinh
dinh day » dinh dat, dinh dao, dinh da
su sach » so sach, vu sach
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
van cau » van dau, van hau, van chat
day cua » dai cua
cua tre » cua te, cuu tre, cua triet

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 (toc sach)) ky tang xa hoi. hieu van cau chuc van dinh day cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (toc sach)) ky tang xa hoi. hieu van cau chuc van dinh day cua tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (toc sach)) ky tang xa hoi. hieu van cau chuc van dinh day cua tre*.