Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
thuc day » thuc dan, thuc vat
thu nang » thi nang, thu bang, tho nang
thu hang » thi hang, thuc hanh, thu huong
cam thuc » am thuc, nam thuc, cam thu
hanh de » hanh ve, hanh kem
danh di » danh du, xanh di, danh dien
qua cam » qua cham, qua cac, qua ca
cua tre » cua te, cuu tre, cua triet
mai hoi » mai khoi, dai hoi, lai hoi

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 ((thu nang) OR (thu hang)) mai 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 ((thu nang) OR (thu hang)) mai 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 ((thu nang) OR (thu hang)) mai hoi. hieu qua cam thuc day ((danh di) or (hanh de)) cua tre".
• Adding a wildcard symbol may retrieve word variants: toc sach ((thu nang) OR (thu hang)) mai hoi. hieu qua cam thuc day ((danh di) or (hanh de)) cua tre*.