Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
ve triet » va trien, su triet
van cau » van dau, van hau, van chat
y nang » ky nang, ly nang, v nang
nang o » nang co, nang ho, nang ro
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa
o hoi » co hoi, o hoc, o hai
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: thu sach y nang o hoi. hieu van cau ((xuc va) OR (tuc va)) hanh vi ve triet~.
• Adding a wildcard symbol may retrieve word variants: thu sach y nang o hoi. hieu van cau ((xuc va) or (tuc va)) hanh vi ve triet*.