Perhaps you should try some spelling variations:
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
cac tuc » cac toc, cac tu, cac tac
tuc van » thuc van, truc van, tuc va
hanh di » hanh de, hang di, danh di
cuu tre » cau tren, cau treo
cua tre » cua te, cua triet, dua tren

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