Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien cac » vien bach, vien dai, vien da
dinh vai » dinh van, dinh vi, dinh va
cuu tre » cau tren, cau treo
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cua triet, dua tren
te sai » te tai, te bai, te lai
sai ky » sac ky
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 sai ky nang xa hoi. hieu vien cac ((lo va) or (ly va)) dinh vai ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sai ky nang xa hoi. hieu vien cac ((lo va) OR (ly va)) dinh vai ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sai ky nang xa hoi. hieu vien cac ((lo va) or (ly va)) dinh vai ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: te sai ky nang xa hoi. hieu vien cac ((lo va) or (ly va)) dinh vai ((cua tre) OR (cuu tre))*.