Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien cac » vien bach, vien dai, vien da
hanh vai » hanh va, hanh tai, hanh voi
hanh van » thanh van, khanh van, hanh va
cua tre » cua te, cuu tre, cua triet
so sac » so sach, so dac
sac ky » cac ky, sai ky
cac lo » cac lop, cac co, cac bo
lo van » le van, vo van, so van
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: so sac ky nang x hoi. hieu vien cac lo van ((((hanh vai) or (hanh van))) or (hanh vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sac ky nang x hoi. hieu vien cac lo van ((((hanh vai) OR (hanh van))) OR (hanh vi)) cua tre.
• Adding a wildcard symbol may retrieve word variants: so sac ky nang x hoi. hieu vien cac lo van ((((hanh vai) or (hanh van))) or (hanh vi)) cua tre*.