Perhaps you should try some spelling variations:
doc sach » hoc sach, toc sach, nuoc sach
cam thuc » am thuc, nam thuc, cam thu
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
danh di » danh du, xanh di, danh dien
hanh de » hanh ve, hanh kem
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc sach ky nang x hoi. hieu va cam thuc vat ((danh di) or (hanh de)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach ky nang x hoi. hieu va cam thuc vat ((danh di) OR (hanh de)) cua tre.
• Adding a wildcard symbol may retrieve word variants: doc sach ky nang x hoi. hieu va cam thuc vat ((danh di) or (hanh de)) cua tre*.