Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
thanh di » thanh doi, thanh de, thanh do
duy van » duy vat, dung van
hieu ve » hieu va, hieu van
tu sach » thu sach, te sach, tu cach
tu nang » tru nang, tu nong, tu nano
su sach » so sach, vu sach
ve pham » vi pham, v pham, ve phan
duy va » duy vat, day va, duy v
x hoi » xa hoi, o hoi, x ho
di su » doi su, ki su, da 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) OR (su sach)) tu nang x hoi. hieu ve pham ((duy va) OR (duy van)) thanh di su triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) tu nang x hoi. hieu ve pham ((duy va) or (duy van)) thanh di su triet~".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (su sach)) tu nang x hoi. hieu ve pham ((duy va) or (duy van)) thanh di su triet*.