Perhaps you should try some spelling variations:
cac thuc » cach thuc, cac thu, can thuc
dinh doi » dinh moi, tinh doi, dinh toi
so sach » so sanh, bo sach, co sach
tang ma » mang may, tang van
thuc va » thuc vat, thuc dan, thuc day
va dinh » van dinh, va kinh, va tinh
doi cua » dai cua, hoi cua
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 y ((nang x) or (tang ma)) hoi. lieu va cac thuc va dinh doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y ((nang x) OR (tang ma)) hoi. lieu va cac thuc va dinh doi cua tre.
• Adding a wildcard symbol may retrieve word variants: so sach y ((nang x) or (tang ma)) hoi. lieu va cac thuc va dinh doi cua tre*.