Perhaps you should try some spelling variations:
nam thuoc » nam thu, nha thuoc, cay thuoc
nang loai » dang loai, nang noi, nhan loai
nam thuc » am thuc, nam thu, nam tu
loai hoc » logic hoc, loai khoa, dai hoc
hanh dai » hanh tai, hanh dao, vanh dai
so sach » so sanh, bo sach, co sach
va hanh » van hanh, va thanh, va danh
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
hieu ve » hieu van
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 loai hoc. ((hieu ve) or (hieu va)) ((nam thuc) OR (nam thuoc)) va hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky nang loai hoc. ((hieu ve) OR (hieu va)) ((nam thuc) OR (nam thuoc)) va hanh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky nang loai hoc. ((hieu ve) or (hieu va)) ((nam thuc) OR (nam thuoc)) va hanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: so sach ky nang loai hoc. ((hieu ve) or (hieu va)) ((nam thuc) OR (nam thuoc)) va hanh dai cua tre*.