Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
thanh de » hanh de, thanh ve, thanh do
va thanh » gia thanh, ban thanh, va tinh
cua tre » cua te, cua triet, dua tren
thuc va » thuc vat, thuc dan, thuc day
cuu tre » cau tren, cau treo
hieu le » hieu ve, hieu he, hieu ly
mai hoi » mai khoi, dai hoi, lai hoi
le nam » ly nam, he nam, le na
ma hoi » xa hoi, ma hoa, me hoi
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 ((ma hoi) OR (mai hoi)). hieu le nam thuc va thanh de ((cua tre) OR (cuu tre))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cao ky nang ((ma hoi) or (mai hoi)). hieu le nam thuc va thanh de ((cua tre) OR (cuu tre))~".
• Adding a wildcard symbol may retrieve word variants: tu cao ky nang ((ma hoi) or (mai hoi)). hieu le nam thuc va thanh de ((cua tre) OR (cuu tre))*.