Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien cac » vien bach, vien dai, vien da
ve triet » va trien, su triet
su sach » so sach, vu sach
toc van » hoc van, toc san, oc van
tac van » tac vang, cac van, tac va
y nang » ky nang, ly nang, v nang
anh vi » hanh vi, anh va, anh ve
x hoi » xa hoi, o hoi, x ho
vi ve » va ve, gi ve, ve ve

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: su sach y nang x hoi. hieu vien cac ((toc van) OR (tac van)) anh vi ve triet~.
• Adding a wildcard symbol may retrieve word variants: su sach y nang x hoi. hieu vien cac ((toc van) or (tac van)) anh vi ve triet*.