Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
cam thuc » am thuc, nam thuc, cam thu
sach tu » cach tu, sach ty, sach uu
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh
danh di » danh du, xanh di, danh dien
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao
di cua » dai cua, doi cua, de cua
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: te ((sach thu) or (sach tu)) nang x hoi. hieu va cam thuc va danh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach thu) OR (sach tu)) nang x hoi. hieu va cam thuc va danh di cua tre.
• Adding a wildcard symbol may retrieve word variants: te ((sach thu) or (sach tu)) nang x hoi. hieu va cam thuc va danh di cua tre*.