Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
toc sach » hoc sach, doc sach, thuoc sach
hanh vai » hanh vi, hanh va, hanh tai
vien cac » vien bach, vien dai, vien da
nang co » nang cao, nang doc, nang noi
cuc ban » cua ban, cuu ban, duc ban
cac ban » cac dan, cac van, can ban
su sach » so sach, vu sach
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
co hoi » co hoc, co loi

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc sach) or (su sach)) ky nang co hoi. hieu vien cac ((cuc ban) or (cac ban)) hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (su sach)) ky nang co hoi. hieu vien cac ((cuc ban) OR (cac ban)) hanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (su sach)) ky nang co hoi. hieu vien cac ((cuc ban) or (cac ban)) hanh vai cua tre*.