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
dai lao » dai lan, dai thao, dai luan
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang
lao va » tao va, cao va, bao va
cua tu » cua tuc, cua su, cua cu

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 ((y nang) or (v nang)) xa hoi. hieu vien dai lao va ((dinh vai) OR (dinh van)) cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((y nang) OR (v nang)) xa hoi. hieu vien dai lao va ((dinh vai) OR (dinh van)) cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((y nang) or (v nang)) xa hoi. hieu vien dai lao va ((dinh vai) OR (dinh van)) cua tu".
• Adding a wildcard symbol may retrieve word variants: te sach ((y nang) or (v nang)) xa hoi. hieu vien dai lao va ((dinh vai) OR (dinh van)) cua tu*.