Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
cua viet » ca viet, hoa viet, cua vat
danh vai » danh sai, danh va, doanh van
vai cua » dai cua, hai cua, lai cua
va danh » va dinh, va dan, va hanh
thuc va » thuc vat, thuc dan, thuc day
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
so sach » so sanh, co sach, hoc sach
mai doi » moi doi, mai hoi, mai khoi
bo sach » co sach, hoc sach
lai hoi » dai hoi, lai hoa, lai roi
y nang » ky nang, ly nang, v nang

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) OR (bo sach)) y nang ((mai doi) OR (lai hoi)). hieu ve cham thuc va danh vai cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) OR (bo sach)) y nang ((mai doi) or (lai hoi)). hieu ve cham thuc va danh vai cua viet~".
• Adding a wildcard symbol may retrieve word variants: ((so sach) OR (bo sach)) y nang ((mai doi) or (lai hoi)). hieu ve cham thuc va danh vai cua viet*.