Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
mai khoi » mai khoa, tai khoa, cac khoi
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
hieu va » lieu va, hieu qua
so sach » so sanh, bo sach, co sach
hieu ve » hieu van
mai hoi » dai hoi, lai hoi, mai doi
y nang » ky nang, ly nang, v nang
xuc va » duc va, tuc va, luc va
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach y nang ((mai hoi) or (mai khoi)). ((hieu ve) OR (hieu va)) cam xuc va danh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y nang ((mai hoi) OR (mai khoi)). ((hieu ve) OR (hieu va)) cam xuc va danh vi cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach y nang ((mai hoi) or (mai khoi)). ((hieu ve) OR (hieu va)) cam xuc va danh vi cua viet".
• Adding a wildcard symbol may retrieve word variants: so sach y nang ((mai hoi) or (mai khoi)). ((hieu ve) OR (hieu va)) cam xuc va danh vi cua viet*.