Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
cua tre » cua te, cuu tre, cua triet
cac xuc » cac nuoc, chat xuc, cac cuoc
hieu ve » hieu va, hieu van
lang xa » dang xay, lang van
lang ha » long ha
sac ky » cac ky, sai ky
vi cua » vai cua, di cua
tu sac » tu sach, tu cac, tu san

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: tu sac ky ((lang xa) OR (lang ha)) hoi. hieu ve ((cac xuc) OR (cam xuc)) van hanh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky ((lang xa) OR (lang ha)) hoi. hieu ve ((cac xuc) or (cam xuc)) van hanh vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu sac ky ((lang xa) OR (lang ha)) hoi. hieu ve ((cac xuc) or (cam xuc)) van hanh vi cua tre*.