Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
thanh va » thanh van, hanh va, thanh ve
thanh ha » thanh hoa, thanh hai, nhanh ha
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
van cac » van hac, van cau, van bac
cac tac » cac toc, cac bac, cac dac
y nang » ky nang, ly nang, v nang
nang o » nang co, nang ho, nang ro
tac xa » tuc xa, tac da
o hoi » co hoi, o hoc, o hai

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 y nang o hoi. hieu van cac tac xa ((thanh va) or (thanh ha)) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang o hoi. hieu van cac tac xa ((thanh va) OR (thanh ha)) su triet.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang o hoi. hieu van cac tac xa ((thanh va) or (thanh ha)) su triet*.