Perhaps you should try some spelling variations:
ban banh » ban anh, ban danh, ban thanh
ban hanh » ban hang
cua viet » ca viet, hoa viet, cua vat
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va
vai cua » dai cua, hai cua, lai cua
ma hoi » mai hoi, xa hoi, ma hoa

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