Perhaps you should try some spelling variations:
thuc van » thuc dan, thuc va, thuc hanh
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
hanh di » hanh de, hang di, danh di
cuu tre » cua tre, cau tren, cau treo
va nam » van nam, ha nam, va nay

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 nam ((thuc van) OR (thuc vat)) ((hanh di) or (hanh vi)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach tu nong xa hoi. hieu va nam ((thuc van) OR (thuc vat)) ((hanh di) OR (hanh vi)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach tu nong xa hoi. hieu va nam ((thuc van) OR (thuc vat)) ((hanh di) or (hanh vi)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: te sach tu nong xa hoi. hieu va nam ((thuc van) OR (thuc vat)) ((hanh di) or (hanh vi)) cuu tre*.