Perhaps you should try some spelling variations:
ban hanh » ban hang
sach thu » sach thue, sach thieu, sach tham
duc ban » duc tan, duc van, dua ban
cac duc » cac du, cao duc, cac dac
hieu ve » hieu va, hieu van
sach ty » sach y, sach tu, xach tay
hang xa » hoang xa, hang va, hang ca
ve cac » va cac, vien cac
cua te » cua tu
cua su » qua su

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach ty) or (sach thu)) hang xa hoi. hieu ve cac duc ban hanh vi ((cua te) or (cua su))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (sach thu)) hang xa hoi. hieu ve cac duc ban hanh vi ((cua te) OR (cua su)).
• Adding a wildcard symbol may retrieve word variants: su ((sach ty) or (sach thu)) hang xa hoi. hieu ve cac duc ban hanh vi ((cua te) or (cua su))*.