Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
cua tre » cua te, cua triet, dua tren
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
cuu tre » cau tren, cau treo
ve tham » va tham, ve cham, vi tham
hieu ve » hieu va, hieu van
lai hoi » dai hoi, lai hoa, lai roi
mai hoi » mai khoi, dai hoi, mai doi
vu cao » cu cao, va 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: vu cao ky nang ((mai hoi) OR (lai hoi)). hieu ve tham thuc va hanh va ((cua tre) OR (cuu tre))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu cao ky nang ((mai hoi) OR (lai hoi)). hieu ve tham thuc va hanh va ((cua tre) or (cuu tre))~".
• Adding a wildcard symbol may retrieve word variants: vu cao ky nang ((mai hoi) OR (lai hoi)). hieu ve tham thuc va hanh va ((cua tre) or (cuu tre))*.