Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
hanh hai » thanh hai, nhanh hai, hang hai
cam thuc » am thuc, nam thuc, cam thu
hai cua » thai cua, dai cua, hoi 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, bo sach, hoc sach
mai doi » moi doi, mai hoi, mai khoi
co sach » bo sach, cuon 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 (co sach)) v nang ((mai doi) or (lai hoi)). hieu ve cam thuc va hanh hai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (co sach)) v nang ((mai doi) OR (lai hoi)). hieu ve cam thuc va hanh hai cua viet.
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (co sach)) v nang ((mai doi) or (lai hoi)). hieu ve cam thuc va hanh hai cua viet*.