Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh van » thanh san, thanh toan, thanh phan
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cua triet, dua tren
tuc ban » thuc ban, truc ban, tu ban
vang xa » lang xa, mang xa, ang xa
ty vang » ty xang, ty van, ly vang
cuu tre » cau tren, cau treo
va cai » va bai, va dai, va cao

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

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