Perhaps you should try some spelling variations:
ve triet » va trien, su triet
hanh ki » hanh vi, hanh ky, hanh kien
luu van » cuu van, luan van, luu hanh
vuc van » duc van, luc van, thuc van
tu sach » thu sach, su sach, te sach
sach uu » sach luu, sach tu, sach xu
lai hoi » dai hoi, lai hoa, lai roi
uu dang » huu dang, su dang, vu dang
hieu va » lieu va, hieu qua
ki ve » ke ve, gi ve, vi 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: tu sach uu dang ((xa hoi) OR (lai hoi)). hieu va cac ((vuc van) OR (luu van)) hanh ki ve triet~.
• Adding a wildcard symbol may retrieve word variants: tu sach uu dang ((xa hoi) or (lai hoi)). hieu va cac ((vuc van) or (luu van)) hanh ki ve triet*.