Perhaps you should try some spelling variations:
thuc day » thuc dan, thuc vat
sach thu » sach thue, sach thieu, sach tham
hanh de » hanh ve, hanh kem
danh di » danh du, xanh di, danh dien
ca thuc » can thuc, cay thuc, va thuc
sach ty » sach y, sach tu, xach tay
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
qua ca » qua cac, qua cua, qua cai

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 ty) or (sach thu)) nang xa hoi. hieu qua ca thuc day ((danh di) or (hanh de)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach ty) OR (sach thu)) nang xa hoi. hieu qua ca thuc day ((danh di) OR (hanh de)) cua tre.
• Adding a wildcard symbol may retrieve word variants: toc ((sach ty) or (sach thu)) nang xa hoi. hieu qua ca thuc day ((danh di) or (hanh de)) cua tre*.