Perhaps you should try some spelling variations:
nhan loai » phan loai, nhan tai
loai hoc » logic hoc, loai khoa, dai hoc
nam thuc » nam thuoc, am thuc, nam thu
hanh dai » hanh tai, hanh dao, vanh dai
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
ky nhan » ly nhan, ky nhat, khi nhan
hieu ve » hieu van
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
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 nhan loai hoc. ((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 nhan loai hoc. ((hieu ve) OR (hieu va)) nam thuc va hanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: so sach ky nhan loai hoc. ((hieu ve) or (hieu va)) nam thuc va hanh dai cua tre*.