Perhaps you should try some spelling variations:
thanh van » thanh san, thanh toan, thanh phan
ve triet » va trien, su triet
tru nang » tra nang, tri nang, truc nano
hieu van » hieu va, thien van, lieu va
cac tac » cac toc, cac bac, cac dac
van cac » van hac, van cau, van bac
tu sach » thu sach, su sach, te sach
tu nang » tu nong, tu nano, tu lang
van ve » van de, ban ve, van le
o hoi » co hoi, o hoc, o hai
x hoi » xa hoi, x ho, 5 hoi
gia » giao

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((tu nang) OR (tru nang)) ((x hoi) or (o hoi)). hieu van cac tac gia thanh van ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((tu nang) OR (tru nang)) ((x hoi) OR (o hoi)). hieu van cac tac gia thanh van ve triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((tu nang) OR (tru nang)) ((x hoi) or (o hoi)). hieu van cac tac gia thanh van ve triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ((tu nang) OR (tru nang)) ((x hoi) or (o hoi)). hieu van cac tac gia thanh van ve triet*.