Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
te sach » toc sach
vai cua » dai cua, hai cua, lai cua
xa hanh » xa thanh, xa khanh, va hanh
cua tre » cua te, cuu tre, cua triet
tu cong » thu cong, te cong, tai cong
tu nong » tu dong, tu tong, tu tuong
va dao » ca dao
duc xa » duoc xa, tuc xa, duc va
va cao » va cac, va co, va bao

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 ((tu nong) OR (tu cong)) xa hoi. hieu ((va cao) or (va dao)) duc xa hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((tu nong) OR (tu cong)) xa hoi. hieu ((va cao) OR (va dao)) duc xa hanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((tu nong) OR (tu cong)) xa hoi. hieu ((va cao) or (va dao)) duc xa hanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ((tu nong) OR (tu cong)) xa hoi. hieu ((va cao) or (va dao)) duc xa hanh vai cua tre*.