Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
hieu vien » hieu viec, thieu nien, hieu tieng
hanh vai » hanh vi, hanh va, hanh tai
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
cac duc » cac du, cao duc, cac dac
cua tre » cua te, cuu tre, cua triet
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang

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: ((so sanh) OR (do sanh)) ky lang xa hoi. ((hieu vien) OR (hieu hien)) cac duc va hanh vai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sanh) OR (do sanh)) ky lang xa hoi. ((hieu vien) or (hieu hien)) cac duc va hanh vai cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((so sanh) OR (do sanh)) ky lang xa hoi. ((hieu vien) or (hieu hien)) cac duc va hanh vai cua tre*.