Perhaps you should try some spelling variations:
van danh » van doanh, van anh, van hanh
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
cao hoi » cau hoi, co hoi, cao hoc
va cham » va chat, va tham
va cam » va cac, va cao, va cai

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 nang cao hoi. hieu ((va cam) OR (va cham)) xuc ((van danh) or (ban hang)) mai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang cao hoi. hieu ((va cam) OR (va cham)) xuc ((van danh) OR (ban hang)) mai va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang cao hoi. hieu ((va cam) OR (va cham)) xuc ((van danh) or (ban hang)) mai va triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang cao hoi. hieu ((va cam) OR (va cham)) xuc ((van danh) or (ban hang)) mai va triet*.