Perhaps you should try some spelling variations:
ban doanh » van doanh, san doanh, ban danh
te sach » toc sach
tang ma » mang may, tang van
hoc ban » hoc bang, hoc dan, hoc bai
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet
sach v » sach va, sach y, sach 2
v tang » 6 tang, 7 tang, 5 tang
ma hoi » mai hoi, xa hoi, ma hoa
va cam » va cham, va cac, va cai
va cao » va cac, va co, va dao

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach v tang ma hoi. hieu ((va cam) or (va cao)) hoc ban doanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach v tang ma hoi. hieu ((va cam) OR (va cao)) hoc ban doanh tai cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach v tang ma hoi. hieu ((va cam) or (va cao)) hoc ban doanh tai cua tre*.