Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
cua triet » cua viet, su triet, va triet
thanh hai » thanh phan, thanh hoa, thanh san
cau tren » cu tren, dau tren, ca tren
lang van » dang van, tang van, hoang van
ky lang » ky nang, ky dang, ky tang
te sac » te sach, te cac, te san
tu ban » thu ban, te ban
sac ky » cac ky, sai ky
va dao » ca 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 sac ky lang van hoa. hieu ((va bai) or (va dao)) tu ban thanh hai ((cua triet) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky lang van hoa. hieu ((va bai) OR (va dao)) tu ban thanh hai ((cua triet) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: te sac ky lang van hoa. hieu ((va bai) or (va dao)) tu ban thanh hai ((cua triet) or (cau tren))*.