Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
mai khoi » mai khoa, tai khoa, cac khoi
danh vai » danh sai, danh va, doanh van
vai cua » dai cua, hai cua, lai cua
va danh » va dinh, va dan, va hanh
so sach » so sanh, bo sach, co sach
lai hoi » dai hoi, lai hoa, lai roi
sach v » sach va, sach y, sach 2
ve cac » va cac, vien cac
thu va » thuc va, thue va, tu va
v nang » va nang, vu nang, van nang
ve cam » ve cham, va cam, ve cai

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

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