Perhaps you should try some spelling variations:
nay thuc » nam thuc, cay thuc, day thuc
te sach » toc sach
sach tu » sach thu, cach tu, sach ty
tu nong » tu dong, tu cong, tu tong
nong xa » song xa, dong xa, nong va
hieu va » lieu va, hieu qua
danh di » danh du, xanh di, danh dien
cua tre » cua te, cuu tre, cua triet
va nay » va ngay, va cay

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 tu nong xa hoi. hieu va nay thuc vat ((danh di) or (hanh vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach tu nong xa hoi. hieu va nay thuc vat ((danh di) OR (hanh vi)) cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach tu nong xa hoi. hieu va nay thuc vat ((danh di) or (hanh vi)) cua tre*.