Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh vi » hanh vi, thanh va, thanh ve
tu sach » thu sach, su sach, te sach
tu hang » thu hang, tu hanh, tu hung
hang do » hang doi, dang do, hang di
sach tu » sach thu, cach tu, sach ty
duc ban » duc tan, duc van, dua ban
vi cua » vai cua, di cua
cua te » cua tu
va cao » va cac, va co, va dao
ve cai » va cai, ve cac, ve tai
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 tu hang do hoi. hieu ((ve cai) or (va cao)) duc ban thanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tu hang do hoi. hieu ((ve cai) OR (va cao)) duc ban thanh vi cua te.
• Adding a wildcard symbol may retrieve word variants: tu sach tu hang do hoi. hieu ((ve cai) or (va cao)) duc ban thanh vi cua te*.