Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien cac » vien bach, vien dai, vien da
dinh dai » dinh dat, sinh dai, dinh dao
nang xa » nang x, lang xa, nang ma
va dinh » van dinh, va kinh, va tinh
cua tre » cuu tre, cua triet, dua tren
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky
cac lo » cac lop, cac co, cac bo
cua te » cua tu
lo va » lo van, lao va, ly 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 ky nang xa hoi. hieu vien cac lo va dinh dai ((cua tre) OR (cua te))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky nang xa hoi. hieu vien cac lo va dinh dai ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: te sac ky nang xa hoi. hieu vien cac lo va dinh dai ((cua tre) OR (cua te))*.