Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
hanh vai » hanh vi, hanh va, hanh tai
cam thuc » am thuc, nam thuc, cam thu
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
hieu ve » hieu va, hieu van
so sach » so sanh, co sach, hoc sach
mai hoi » mai khoi, dai hoi, mai doi
bo sach » co sach, hoc sach
lai hoi » dai hoi, lai hoa, lai roi
ve cam » ve cham, ve cac, va cam
v nang » va nang, vu nang, van nang

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