Perhaps you should try some spelling variations:
ban hang » ngan hang
va triet » va thiet, va trien, ve triet
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
hieu ve » hieu va, hieu van
cac tac » cac toc, cac bac, cac dac
ve cac » va cac, vien cac
vai va » mai va, dai va, hai va

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 ky dang xa hoi. hieu ve cac tac ((ban hanh) or (ban hang)) vai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky dang xa hoi. hieu ve cac tac ((ban hanh) OR (ban hang)) vai va triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ky dang xa hoi. hieu ve cac tac ((ban hanh) or (ban hang)) vai va triet*.