Perhaps you should try some spelling variations:
cua triet » cua viet, va triet
hieu van » hieu va, thien van, hieu ve
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
truc va » thuc va, thuc vat, trung va
va danh » va dinh, va dan, va hanh
danh te » danh tu, danh het, danh yen
y nang » ky nang, ly nang, v nang
nang o » nang co, nang ho, nang ro
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 y nang o hoi. ((hieu van) OR (lieu va)) cau truc va danh te ((cua triet) OR (su triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang o hoi. ((hieu van) or (lieu va)) cau truc va danh te ((cua triet) OR (su triet))~".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang o hoi. ((hieu van) or (lieu va)) cau truc va danh te ((cua triet) OR (su triet))*.