Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
thuc day » thuc dan, thuc vat
sach ty » sach y, sach tu, sach thu
hanh de » hanh ve, hanh kem
danh di » danh du, xanh di, danh dien
qua cac » cua cac
qua cam » qua cham, qua ca, qua cai
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa

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