Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
cau tren » cu tren, dau tren, ca tren
te sach » toc sach
sach ty » sach y, sach tu, sach thu
xang xa » lang xa, mang xa, ang xa
hieu va » lieu va
cam tuc » cam xuc, cam tu, nam thuc
tuc van » thuc van, truc van, tuc va
cuu tre » cua tre, cau treo

You may be able to get more results by adjusting your search query.

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