Perhaps you should try some spelling variations:
ban doanh » van doanh, san doanh, ban danh
thu sach » tu sach, thuat sach, thuoc sach
nang mai » nang ma, nang tai, lang mai
ban hanh » ban hang
su triet » su viet, su tien, ve triet
sach ky » sac ky, sach y, sach ty
mai hoi » mai khoi, dai hoi, lai hoi
va cam » va cham, va cac, va cai
va cao » va cac, va co, va dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky nang mai hoi. lieu ((va cam) OR (va cao)) dua ((ban doanh) or (ban hanh)) va su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang mai hoi. lieu ((va cam) OR (va cao)) dua ((ban doanh) OR (ban hanh)) va su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang mai hoi. lieu ((va cam) OR (va cao)) dua ((ban doanh) or (ban hanh)) va su triet".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang mai hoi. lieu ((va cam) OR (va cao)) dua ((ban doanh) or (ban hanh)) va su triet*.