Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
ban thanh » ban hanh, ban hang
tu sach » thu sach, su sach, te sach
ty dang » ty xang, ky dang, ty hang
dang do » nang doc, dang duc, dung doi
cuu tre » cua tre, cau tren, cau treo
hieu ve » hieu va, hieu van
cac dua » cach dua, cac qua, ca dua
sach ty » sach y, sach tu, sach thu
cua te » cua tu
do hoi » do choi, do hoai, do thoi

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 dang do hoi. hieu ve ((cac dua) or (cac du)) ban thanh tai ((cuu tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty dang do hoi. hieu ve ((cac dua) OR (cac du)) ban thanh tai ((cuu tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: tu sach ty dang do hoi. hieu ve ((cac dua) or (cac du)) ban thanh tai ((cuu tre) or (cua te))*.