Perhaps you should try some spelling variations:
thuc day » thuc dan, thuc vat
cam thuc » am thuc, nam thuc, cam thu
sach thu » sach thue, sach thieu, sach tham
nang xa » nang x, lang xa, nang ma
qua cam » qua cham, qua cac, qua ca
sach ty » sach y, sach tu, xach tay
danh di » danh du, xanh di, danh dien
hanh de » hanh ve, hanh kem
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: toc ((sach ty) OR (sach thu)) nang xa hoi. hieu qua cam 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 cam thuc day ((danh di) OR (hanh de)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach ty) OR (sach thu)) nang xa hoi. hieu qua cam 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 cam thuc day ((danh di) or (hanh de)) cua tre*.