Perhaps you should try some spelling variations:
nang lai » nang tai, mang lai, nang cai
vanh dai » van dai, vanh tai, lanh dao
nam thuc » nam thuoc, am thuc, nam thu
cuu tre » cau tren, cau treo
thuc va » thuc vat, thuc dan, thuc day
lai hoa » dai hoa, loai hoc
hieu ve » hieu van
cua tre » cua te, cua triet, dua tren
hieu va » lieu va, hieu qua
va vanh » va van, va danh, va hanh
so sac » so sach, so dac
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sac ky nang lai hoa. ((hieu ve) or (hieu va)) nam thuc va vanh dai ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sac ky nang lai hoa. ((hieu ve) OR (hieu va)) nam thuc va vanh dai ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sac ky nang lai hoa. ((hieu ve) or (hieu va)) nam thuc va vanh dai ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: so sac ky nang lai hoa. ((hieu ve) or (hieu va)) nam thuc va vanh dai ((cua tre) OR (cuu tre))*.