Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
cuu tre » cau tren, cau treo
thuc va » thuc vat, thuc dan, thuc day
ky sang » ky nang, ky dang, ky tang
mai hoi » mai khoi, dai hoi, mai doi
cua tre » cua te, cua triet, dua tren
lai hoi » dai hoi, lai hoa, lai roi
hieu ve » hieu va, hieu van
dan du » dan dau, danh du, dan su
vu ban » tu ban, va ban
va dan » ca dan, va dao, va dau
ban ky » van ky, dan ky
ve nam » he nam, va nam, le nam

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vu ban ky sang ((mai hoi) or (lai hoi)). hieu ve nam thuc va dan du ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu ban ky sang ((mai hoi) OR (lai hoi)). hieu ve nam thuc va dan du ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: vu ban ky sang ((mai hoi) or (lai hoi)). hieu ve nam thuc va dan du ((cua tre) or (cuu tre))*.