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 ve » hieu va, hieu van
cam thu » nam thu, cac thu, ca thu
cam tu » nam tu, dam tu, tam tu
vi cua » vai cua, di cua

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 ve ((cam tu) OR (cam thu)) van hanh vi cua vat~.
• Adding a wildcard symbol may retrieve word variants: te sach ty xang xa hoi. hieu ve ((cam tu) or (cam thu)) van hanh vi cua vat*.