Perhaps you should try some spelling variations:
dan hanh » dang hanh, dan khanh, dan thanh
tu sach » thu sach, su sach, te sach
xang xa » lang xa, ang xa, dang xay
mang xa » lang xa, mang may, dang xay
va cham » va chat, va tham
vu kham » vu khanh
cua tre » cua te, cuu tre, cua triet
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: tu sach y ((xang xa) or (mang xa)) hoi. hieu ((va cham) or (vu kham)) hoc dan hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((xang xa) OR (mang xa)) hoi. hieu ((va cham) OR (vu kham)) hoc dan hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach y ((xang xa) or (mang xa)) hoi. hieu ((va cham) or (vu kham)) hoc dan hanh vi cua tre*.