Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
van hang » van khang, van hoang, van thang
truc van » truc va, thuc van, truc ban
cac truc » cau truc, cac tru, cac trung
vien cac » vien bach, vien dai, vien da
su sach » so sach, vu sach
sach v » sach va, sach y, sach 2
ma hoi » mai hoi, ma hoa, me hoi
v nang » va nang, vu nang, van nang
de cua » te cua, dieu cua
le cua » ly cua

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 v nang ((ma hoi) OR (xa hoi)). hieu vien cac truc van hang ((de cua) OR (le cua)) triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach v nang ((ma hoi) or (xa hoi)). hieu vien cac truc van hang ((de cua) OR (le cua)) triet~".
• Adding a wildcard symbol may retrieve word variants: su sach v nang ((ma hoi) or (xa hoi)). hieu vien cac truc van hang ((de cua) OR (le cua)) triet*.