Perhaps you should try some spelling variations:
thien van » thi van
su triet » su viet, su tien, ve triet
hanh dai » hanh tai, hanh dao, vanh dai
van dau » van dao, phan dau
nang o » nang co, nang ho, nang ro
sach v » sach va, sach 2, sach vay
luc va » duc va, loc va
tuc va » thuc va, truc va, tuc xa
dai su » dai sua, dai so, dan su
o hoi » co hoi, o hoc, o hai

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 v) OR (sach y)) nang o hoi. thien van dau ((luc va) OR (tuc va)) hanh dai su triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach v) OR (sach y)) nang o hoi. thien van dau ((luc va) or (tuc va)) hanh dai su triet~".
• Adding a wildcard symbol may retrieve word variants: tu ((sach v) OR (sach y)) nang o hoi. thien van dau ((luc va) or (tuc va)) hanh dai su triet*.