Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien dai » hien dai
dinh vai » dinh vi, dinh va, dinh tai
te sach » toc sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
dai lo » dai so, dai ly, dai o
cua tu » cua tuc, cua su, cua cu
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 sach ky nang xa hoi. hieu vien dai lo va ((dinh vai) or (dinh van)) ((cua te) OR (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang xa hoi. hieu vien dai lo va ((dinh vai) OR (dinh van)) ((cua te) OR (cua tu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang xa hoi. hieu vien dai lo va ((dinh vai) or (dinh van)) ((cua te) OR (cua tu))".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang xa hoi. hieu vien dai lo va ((dinh vai) or (dinh van)) ((cua te) OR (cua tu))*.