Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
dinh vai » dinh van, dinh vi, dinh va
nang xa » nang x, lang xa, nang ma
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
te sac » te sach, te cac
te san » te ban, ke san, tu san
lo va » lo van, lao va, le va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sac) OR (te san)) ky nang xa hoi. hieu vien bach ((lo va) or (ly va)) dinh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sac) OR (te san)) ky nang xa hoi. hieu vien bach ((lo va) OR (ly va)) dinh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sac) OR (te san)) ky nang xa hoi. hieu vien bach ((lo va) or (ly va)) dinh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((te sac) OR (te san)) ky nang xa hoi. hieu vien bach ((lo va) or (ly va)) dinh vai cua tre*.