Perhaps you should try some spelling variations:
ban hanh » ban hang
lang van » tang van, hoang van, giang van
dang van » hoang van, hang va
tu sach » thu sach, su sach, te sach
ve cham » va cham, ve chat, vu cham
cuu ban » cuu van, cua ban, cuu san
sach ky » sac ky, sach y, sach ty
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 ((lang van) OR (dang van)) hoi. hieu ((ve cham) or (va cac)) cuu ban hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((lang van) OR (dang van)) hoi. hieu ((ve cham) OR (va cac)) cuu ban hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((lang van) OR (dang van)) hoi. hieu ((ve cham) or (va cac)) cuu ban hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((lang van) OR (dang van)) hoi. hieu ((ve cham) or (va cac)) cuu ban hanh vi cua tre*.