Perhaps you should try some spelling variations:
thanh doi » thanh loi, thanh moi, thanh do
ban thanh » ban hanh, ban hang
toc sach » hoc sach, doc sach, thuoc sach
doi cua » dai cua, hoi cua
loc ban » lo ban, hoc ban, coc ban
cua tre » cua te, cuu tre, cua triet
tang ma » mang may, tang van
va cao » va cac, va co, va dao
ma hoi » mai hoi, xa hoi, ma hoa
v tang » 6 tang, 7 tang, 5 tang
va cam » va cham, va cac, va cai

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) OR (toc sach)) v tang ma hoi. hieu ((va cam) or (va cao)) loc ban thanh doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) v tang ma hoi. hieu ((va cam) OR (va cao)) loc ban thanh doi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) v tang ma hoi. hieu ((va cam) or (va cao)) loc ban thanh doi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) v tang ma hoi. hieu ((va cam) or (va cao)) loc ban thanh doi cua tre*.