Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
thanh vi » thanh va, thanh ve, nhanh vi
mai khoi » mai khoa, tai khoa, cac khoi
cua tre » cua te, cuu tre, cua triet
thuc va » thuc vat, thuc dan, thuc day
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
mai hoi » dai hoi, lai hoi, mai doi
tu cao » cu cao, tu cac, vu cao

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: tu cao ky nang ((mai hoi) OR (mai khoi)). hieu ve cham thuc va ((thanh vi) OR (hanh vi)) cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cao ky nang ((mai hoi) OR (mai khoi)). hieu ve cham thuc va ((thanh vi) or (hanh vi)) cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu cao ky nang ((mai hoi) OR (mai khoi)). hieu ve cham thuc va ((thanh vi) or (hanh vi)) cua tre*.