Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc anh
hieu van » hieu va, thien van, lieu va
danh lai » danh sai, gianh lai, dinh lam
hoc cac » hoc cao
duy van » duy vat, dung van
van cam » van nam, van lam, van cau
cam duc » cam xuc, cao duc, pham duc
va danh » va dinh, va dan, va hanh
lai cua » dai cua, hai cua, lai chau
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: ((hoc sach) OR (hoc cac)) ((duy van) or (ty xang)) xa hoi. hieu van cam duc va danh lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc sach) OR (hoc cac)) ((duy van) OR (ty xang)) xa hoi. hieu van cam duc va danh lai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc sach) OR (hoc cac)) ((duy van) or (ty xang)) xa hoi. hieu van cam duc va danh lai cua tre*".