Perhaps you should try some spelling variations:
sach vu » sach va, sach tu, sach xu
sach uu » sach luu, sach tu, sach xu
hieu va » lieu va, hieu qua
xuc van » duc van, vuc van, xuc ban
luc van » luoc van, luu van, duc van
hanh va » hang va, hanh vi
su vien » su viet, su kien, su hien
va cam » va cham, va cac, va cao
x hoi » xa hoi, o hoi, x ho

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: thu ((sach vu) OR (sach uu)) nang x hoi. hieu va cam ((xuc van) OR (luc van)) hanh va su vien~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach vu) OR (sach uu)) nang x hoi. hieu va cam ((xuc van) or (luc van)) hanh va su vien~".
• Adding a wildcard symbol may retrieve word variants: thu ((sach vu) OR (sach uu)) nang x hoi. hieu va cam ((xuc van) or (luc van)) hanh va su vien*.