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

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