Perhaps you should try some spelling variations:
te sach » toc sach
hanh di » hanh de, hang di, danh di
tuc van » thuc van, truc van, tuc va
cam tuc » cam xuc, cam tu, nam thuc
cuu tre » cua tre, cau tren, cau treo
hieu va » lieu va, hieu qua
tu cong » thu cong, te cong, tai cong
tu nong » tu dong, tu tong, tu tuong
va cam » va cham, va cac, va cao

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