Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
te sach » toc sach
cao duc » cao suc, giao duc, tao duoc
lai cua » dai cua, hai cua, lai chau
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
dao duc » giao duc, tao duoc
sang xa » song xa, lang xa, sang ma
ky sang » ky nang, ky dang, ky tang

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 sang xa hoi. hieu van ((dao duc) or (cao duc)) ((va danh) OR (va hanh)) lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky sang xa hoi. hieu van ((dao duc) OR (cao duc)) ((va danh) OR (va hanh)) lai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky sang xa hoi. hieu van ((dao duc) or (cao duc)) ((va danh) OR (va hanh)) lai cua tre*".