Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien dai » hien dai
dinh vai » dinh van, dinh vi, dinh va
vai cua » dai cua, hai cua, lai cua
suat va » xuat va
luat va » xuat va, luat ve, luan va
te sach » toc sach
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
cua tu » cua tuc, cua su, cua cu

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

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