Perhaps you should try some spelling variations:
danh vai » danh sai, danh va, doanh van
cam thuc » am thuc, nam thuc, cam thu
va danh » va dinh, va dan, va hanh
thuc va » thuc vat, thuc dan, thuc day
hieu ve » hieu va, hieu van
lai hoi » dai hoi, lai hoa, lai roi
ca viet » va viet, co viet, hoa viet
mai doi » moi doi, mai hoi, mai khoi
sach v » sach va, sach y, sach vay
ve cam » ve cham, ve cac, va cam
sach 2 » sach y
vai ca » vai cac, vai cua, bai ca

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 v) or (sach 2)) nang ((mai doi) or (lai hoi)). hieu ve cam thuc va danh vai ca viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so ((sach v) OR (sach 2)) nang ((mai doi) OR (lai hoi)). hieu ve cam thuc va danh vai ca viet.
• Adding a wildcard symbol may retrieve word variants: so ((sach v) or (sach 2)) nang ((mai doi) or (lai hoi)). hieu ve cam thuc va danh vai ca viet*.