Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
van khang » van khanh, van thanh, van quang
vien dai » hien dai
dai truc » dai thuc, doan truc, dai trung
su triet » su tien, ve triet
khang da » khang a, khong day, chang dam
truc van » truc va, thuc van, truc ban
su sach » so sach, vu sach
su viet » so viet
vu nang » vuc nang, va nang, vu dang
v nang » va nang, van nang, voi nang
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((v nang) or (vu nang)) x hoi. hieu vien dai truc van khang da ((su triet) OR (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((v nang) OR (vu nang)) x hoi. hieu vien dai truc van khang da ((su triet) OR (su viet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((v nang) or (vu nang)) x hoi. hieu vien dai truc van khang da ((su triet) OR (su viet))*".