Perhaps you should try some spelling variations:
thanh va » thanh van, hanh va, thanh ha
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
hieu ve » hieu va, hieu van
cac tac » cac toc, cac bac, cac dac
nang o » nang co, nang ho, nang ro
ve cac » va cac, vien cac
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 ty nang o hoi. hieu ve cac tac xa ((thanh va) or (thanh san)) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang o hoi. hieu ve cac tac xa ((thanh va) OR (thanh san)) su triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang o hoi. hieu ve cac tac xa ((thanh va) or (thanh san)) su triet*.