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

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 (lai hoi)). hieu ve cam thu va danh vai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y nang ((mai hoi) OR (lai hoi)). hieu ve cam thu va danh vai cua viet.
• Adding a wildcard symbol may retrieve word variants: so sach y nang ((mai hoi) or (lai hoi)). hieu ve cam thu va danh vai cua viet*.