Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh va » thanh van, hanh va, thanh ha
sach ky » sac ky, sach ty, sach kem
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
su tien » su kien, su hien, tu tieng
ve cam » ve cham, ve cac, va cam
cam tu » cam thu, nam tu, dam tu
tu ban » thu ban, te ban

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 ky) or (sach y)) lang xa hoi. hieu ve cam tu ban thanh va su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sach y)) lang xa hoi. hieu ve cam tu ban thanh va su tien.
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) or (sach y)) lang xa hoi. hieu ve cam tu ban thanh va su tien*.