Perhaps you should try some spelling variations:
bo sach » co sach, hoc sach
sach ty » sach y, sach tu, sach thu
xang xa » lang xa, ang xa, dang xay
mang xa » lang xa, mang may, dang xay
cua tre » cua te, cuu tre, cua triet
va bac » van bac, va cac, va bai
loc va » hoc va, luc 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: bo sach ty ((xang xa) OR (mang xa)) hoi. lieu va bac ((duc va) or (loc va)) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo sach ty ((xang xa) OR (mang xa)) hoi. lieu va bac ((duc va) OR (loc va)) hanh vi cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "bo sach ty ((xang xa) OR (mang xa)) hoi. lieu va bac ((duc va) or (loc va)) hanh vi cua tre*".