Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hanh vai » hanh vi, hanh va, hanh tai
vai cua » dai cua, hai cua, lai cua
xa hanh » xa thanh, xa khanh, va hanh
dao duc » giao duc, tao duoc
hieu va » lieu va, hieu qua
tu nong » tu dong, tu tong, tu tuong
tu cong » thu cong, te cong, tai cong
cua tre » cua te, cuu tre, cua triet
va dao » ca dao
duc xa » duoc xa, tuc xa, duc va

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) or (toc sach)) ((tu nong) or (tu cong)) xa hoi. hieu va dao duc xa hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ((tu nong) OR (tu cong)) xa hoi. hieu va dao duc xa hanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ((tu nong) or (tu cong)) xa hoi. hieu va dao duc xa hanh vai cua tre*.