Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
sach ty » sach y, sach tu, sach thu
xang xa » lang xa, mang xa, ang xa
hieu va » lieu va, hieu qua
cam tuc » cam tu, nam thuc, dam thuc
cua tre » cuu tre, cua triet, dua tren
cua te » cua tu

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 ((cam tuc) OR (cam xuc)) van hanh vi ((cua tre) OR (cua te))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty xang xa hoi. hieu va ((cam tuc) or (cam xuc)) van hanh vi ((cua tre) OR (cua te))~".
• Adding a wildcard symbol may retrieve word variants: te sach ty xang xa hoi. hieu va ((cam tuc) or (cam xuc)) van hanh vi ((cua tre) OR (cua te))*.