Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
ban thanh » ban hanh, ban hang
cach dua » cach cua, cach dung, cac du
tu sach » thu sach, su sach, te sach
ve cach » va cach, ve cac, ve canh
cuu tre » cua tre, cau tren, cau treo
dua ban » dia ban, cua ban, qua ban
hieu ve » hieu va, hieu van
ly hang » ly quang
ty hang » ty xang, thi hang, thu hang
do hoi » do choi, do hoai, do thoi
cua te » cua tu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty hang) OR (ly hang)) do hoi. hieu ve cach dua ban thanh tai ((cuu tre) OR (cua te))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ty hang) OR (ly hang)) do hoi. hieu ve cach dua ban thanh tai ((cuu tre) or (cua te))~".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty hang) OR (ly hang)) do hoi. hieu ve cach dua ban thanh tai ((cuu tre) or (cua te))*.