Perhaps you should try some spelling variations:
thuc day » thuc dan, thuc vat
nang cay » nang cao, nang cap, nang cai
cay phoi » cap phoi, tay hoi, cay cho
vai cua » dai cua, hai cua, lai cua
dan vai » dan va, dan tai, dan vat
thuc va » thuc vat, thuc dan
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach kem
hieu va » lieu va, hieu qua
sach ty » sach y, sach tu, sach thu
va nay » va ngay, va cay

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: toc ((sach ky) or (sach ty)) nang cay phoi. hieu va nay ((thuc va) OR (thuc day)) dan vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach ky) OR (sach ty)) nang cay phoi. hieu va nay ((thuc va) OR (thuc day)) dan vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach ky) or (sach ty)) nang cay phoi. hieu va nay ((thuc va) OR (thuc day)) dan vai cua tre".
• Adding a wildcard symbol may retrieve word variants: toc ((sach ky) or (sach ty)) nang cay phoi. hieu va nay ((thuc va) OR (thuc day)) dan vai cua tre*.