Perhaps you should try some spelling variations:
te sach » toc sach
sach tu » sach thu, cach tu, sach ty
xa hanh » xa thanh, xa khanh, va hanh
cua tre » cua te, cuu tre, cua triet
nong xa » song xa, dong xa, nong va
tu nong » tu dong, tu cong, tu tong
va cao » va cac, va co
va bao » va bai
va dao » ca dao
duc xa » duoc xa, tuc xa, duc va
vi cua » vai cua, di cua

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