Perhaps you should try some spelling variations:
thien van » thi van
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, lieu va, hieu ve
ve triet » va trien, su triet
y nang » ky nang, ly nang, v nang
xuc va » tuc va, luc va, xac va
x hoi » xa hoi, o hoi, x ho
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 x hoi. ((hieu van) OR (thien van)) cau ((xuc va) OR (duc va)) hanh vi ve triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y nang x hoi. ((hieu van) OR (thien van)) cau ((xuc va) or (duc va)) hanh vi ve triet~".
• Adding a wildcard symbol may retrieve word variants: thu sach y nang x hoi. ((hieu van) OR (thien van)) cau ((xuc va) or (duc va)) hanh vi ve triet*.