Perhaps you should try some spelling variations:
hieu vien » hieu viec, thieu nien, hieu tieng
hieu hien » bieu hien, dieu hien, chieu chien
van hanh » van thanh, ban hanh, van anh
cach bao » cach nao, sach bao, cach giao
cac bao » cac bai, cac ban, cac bac
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky
vi cua » vai cua, di cua
tu sac » tu sach, tu cac, tu san
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky nang x hoi. ((hieu vien) or (hieu hien)) ((cac bao) or (cach bao)) van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang x hoi. ((hieu vien) OR (hieu hien)) ((cac bao) OR (cach bao)) van hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang x hoi. ((hieu vien) or (hieu hien)) ((cac bao) or (cach bao)) van hanh vi cua tre*.