Perhaps you should try some spelling variations:
ban hang » ngan hang
su triet » su tien, ve triet
tu sach » thu sach, su sach, te sach
va danh » va dinh, va dan, va hanh
sach ky » sac ky, sach y, sach ty
su viet » so viet
cac duc » cac du, cao duc, cac dac
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky lang xa hoi. hieu va cac duc ((ban hang) OR (va danh)) ve ((su triet) OR (su viet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky lang xa hoi. hieu va cac duc ((ban hang) or (va danh)) ve ((su triet) OR (su viet))~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky lang xa hoi. hieu va cac duc ((ban hang) or (va danh)) ve ((su triet) OR (su viet))*.