Perhaps you should try some spelling variations:
nang lai » nang tai, nang cai, nang hai
hanh dai » hanh tai, hanh dao, vanh dai
mang lai » mang lam, mang luoi, dang loai
nam thuc » nam thuoc, am thuc, nam thu
so sach » so sanh, bo sach, co sach
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
hieu ve » hieu van

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

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