Perhaps you should try some spelling variations:
nang loai » dang loai, nang noi, nhan loai
loai hoc » logic hoc, loai khoa, dai hoc
so sach » so sanh, bo sach, co sach
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
hieu va » lieu va, hieu qua
hieu ve » hieu van
sach ky » sac ky, sach y, sach ty
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)) am thuc ((va hanh) OR (va danh)) 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)) am thuc ((va hanh) OR (va danh)) 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)) am thuc ((va hanh) OR (va danh)) dai cua tre".
• Adding a wildcard symbol may retrieve word variants: so sach ky nang loai hoc. ((hieu ve) or (hieu va)) am thuc ((va hanh) OR (va danh)) dai cua tre*.