Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
su triet » su viet, su tien, ve triet
thanh vi » hanh vi, thanh va, thanh ve
hieu van » hieu va, thien van, lieu va
sach ty » sach y, sach tu, sach thu
xuc van » duc van, luc van, xuc ban
tu sach » thu sach, su sach, te sach
hieu ve » hieu va
cao hoc » co hoc, cho hoc, chat hoc
cao hoi » cau hoi, co hoi, tao hoi
ty nang » ky nang, ty xang, ty hang
vi su » va su, ve su, ki su

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 ty nang ((cao hoi) OR (cao hoc)). ((hieu ve) OR (hieu van)) cam xuc van thanh vi su triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang ((cao hoi) OR (cao hoc)). ((hieu ve) or (hieu van)) cam xuc van thanh vi su triet~".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang ((cao hoi) OR (cao hoc)). ((hieu ve) or (hieu van)) cam xuc van thanh vi su triet*.