Perhaps you should try some spelling variations:
ban hanh » ban hang
dang vay » dang van, dang xay, dang vat
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 va » dang van, dang vat, hang 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 va) or (dang vay)) 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 va) OR (dang vay)) 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 va) or (dang vay)) hoi. hieu ((ve cham) or (vu cham)) cac ban hanh vi cua tre*.