Perhaps you should try some spelling variations:
ban hanh » ban hang
dang xay » dang van, van xay
tu sach » thu sach, su sach, te sach
cac ban » cac dan, cac van, can ban
vu cham » va cham, vu kham, tu cham
ve cham » va cham, ve chat, ve chim
sach ky » sac ky, sach y, sach ty
dang xa » lang xa, dang ha, dang va
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 ky ((dang xa) or (dang xay)) hoi. hieu ((ve cham) or (vu cham)) cac ban hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((dang xa) OR (dang xay)) hoi. hieu ((ve cham) OR (vu cham)) cac ban hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((dang xa) or (dang xay)) hoi. hieu ((ve cham) or (vu cham)) cac ban hanh vi cua tre*.