Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
ban hanh » ban hang
ban banh » ban anh, ban danh, ban thanh
thu sach » tu sach, thuat sach, thuoc sach
mai hoi » mai khoi, dai hoi, lai hoi
sach ky » sac ky, sach y, sach ty
vai cua » dai cua, hai cua, lai cua
hieu va » lieu va, hieu qua
va cam » va cham, va cac, va cao
ma hoi » xa hoi, ma hoa, me hoi

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