Perhaps you should try some spelling variations:
hanh dai » hanh tai, hanh dao, vanh dai
toc sach » hoc sach, doc sach, thuoc sach
xa hanh » xa thanh, xa khanh, va hanh
cao duc » dao duc, cao suc, giao duc
hieu va » lieu va, hieu qua
tu nong » tu cong, tu tong, tu tuong
cua tre » cua te, cuu tre, cua triet
va cao » va cac, va co, va 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 dong)) xa hoi. hieu va cao duc xa hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ((tu nong) OR (tu dong)) xa hoi. hieu va cao duc xa hanh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (toc sach)) ((tu nong) OR (tu dong)) xa hoi. hieu va cao duc xa hanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ((tu nong) OR (tu dong)) xa hoi. hieu va cao duc xa hanh dai cua tre*.