Perhaps you should try some spelling variations:
bao thuc » cao thuoc, am thuc, va thuc
hanh hai » thanh hai, nhanh hai, hang hai
sach ty » sach tu, sach thu, xach tay
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
hai cua » thai cua, dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
va bao » va bai
x hoi » o hoi, x ho, 5 hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach ty) or (sach y)) nang ((x hoi) OR (xa hoi)). lieu va bao thuc va hanh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ty) OR (sach y)) nang ((x hoi) OR (xa hoi)). lieu va bao thuc va hanh hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ty) or (sach y)) nang ((x hoi) OR (xa hoi)). lieu va bao thuc va hanh hai cua tre".
• Adding a wildcard symbol may retrieve word variants: te ((sach ty) or (sach y)) nang ((x hoi) OR (xa hoi)). lieu va bao thuc va hanh hai cua tre*.