Perhaps you should try some spelling variations:
ve triet » va trien, su triet
thanh de » hanh de, thanh ve, thanh do
thanh di » thanh doi, thanh do, thanh dinh
pham duy » pham duc
ve pham » vi pham, v pham, ve phan
duy van » duy vat, dung van
tu sach » thu sach, te sach, tu cach
tu nang » tru nang, tu nong, tu nano
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
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) OR (su sach)) tu nang o hoi. hieu ve pham duy van ((thanh di) OR (thanh de)) ve triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) tu nang o hoi. hieu ve pham duy van ((thanh di) or (thanh de)) ve triet~".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (su sach)) tu nang o hoi. hieu ve pham duy van ((thanh di) or (thanh de)) ve triet*.