Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
thanh vi » thanh va, thanh ve, nhanh vi
hieu van » hieu va, thien van, lieu va
ve triet » va trien, su triet
hau xuc » chat xuc
van hau » van ha, van hai, van dau
sach v » sach va, sach y, sach 2
xuc va » duc va, tuc va, luc va
v nang » va nang, vu nang, van nang
o hai » co hai, so hai, o lai
o hoi » co hoi, o hoc, o hoa

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 v nang ((o hoi) OR (o hai)). hieu van hau xuc va ((thanh vi) OR (hanh vi)) ve triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach v nang ((o hoi) OR (o hai)). hieu van hau xuc va ((thanh vi) or (hanh vi)) ve triet~".
• Adding a wildcard symbol may retrieve word variants: thu sach v nang ((o hoi) OR (o hai)). hieu van hau xuc va ((thanh vi) or (hanh vi)) ve triet*.