Perhaps you should try some spelling variations:
thanh do » thanh de, thanh pho, thanh hoa
te sach » toc sach
sach va » sach xa, sach ha, sach dao
cuc ban » cua ban, cac ban, cuu ban
luc ban » duc ban, luc bat, luc van
va tham » van tham, va cham, va thanh
nang ma » tang ma, sang ma, nang cao
va nang » van nang, da nang, cam nang
cua tre » cua te, cuu tre, cua triet
va cao » va cac, va co, va dao
ma hoi » mai hoi, xa hoi, ma hoa
do cua » doi cua, co cua, de cua

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