Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
ban thanh » ban hanh, ban hang
lang van » dang van, tang van, hoang van
cua tre » cua te, cuu tre, cua triet
tuc ban » thuc ban, truc ban, tu ban
lang xa » lang ha, dang xay
san ky » sang ky, van ky, dan ky
va cai » va cac, va bai, va dai
va dao » ca dao
tu san » thu san, tu ban, tu can

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu san ky ((lang xa) OR (lang van)) hoi. hieu ((va cai) or (va dao)) tuc ban thanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky ((lang xa) OR (lang van)) hoi. hieu ((va cai) OR (va dao)) tuc ban thanh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu san ky ((lang xa) OR (lang van)) hoi. hieu ((va cai) or (va dao)) tuc ban thanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu san ky ((lang xa) OR (lang van)) hoi. hieu ((va cai) or (va dao)) tuc ban thanh dai cua tre*.