Perhaps you should try some spelling variations:
cac thuc » cach thuc, cac thu, can thuc
so sach » so sanh, bo sach, co sach
nang ma » tang ma, sang ma, nang cao
thuc va » thuc vat, thuc dan, thuc day
va dinh » van dinh, va kinh, va tinh
dinh di » dinh du, dinh vi, danh di
cua tre » cua te, cuu tre, cua triet
di cua » dai cua, doi cua, de cua

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 y ((nang x) or (nang ma)) hoi. lieu va cac thuc va dinh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y ((nang x) OR (nang ma)) hoi. lieu va cac thuc va dinh di cua tre.
• Adding a wildcard symbol may retrieve word variants: so sach y ((nang x) or (nang ma)) hoi. lieu va cac thuc va dinh di cua tre*.