Perhaps you should try some spelling variations:
cuon sach » duong sach, cuoc cach, co sach
thanh di » thanh doi, thanh de, thanh do
su triet » su viet, su tien, ve triet
so sach » so sanh, bo sach, co sach
toi van » thi van, doi van, moi van
tri van » thi van, tri va, trinh van
di su » doi su, ki su, da su

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((so sach) or (cuon sach)) ky nang x ho. lieu va cac ((toi van) OR (tri van)) thanh di su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (cuon sach)) ky nang x ho. lieu va cac ((toi van) OR (tri van)) thanh di su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) or (cuon sach)) ky nang x ho. lieu va cac ((toi van) OR (tri van)) thanh di su triet".
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (cuon sach)) ky nang x ho. lieu va cac ((toi van) OR (tri van)) thanh di su triet*.