Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
su triet » su viet, su tien, ve triet
thanh di » thanh doi, thanh de, thanh do
hieu van » hieu va, thien van, lieu va
ly hang » ly quang
van cac » van hac, van cau, van bac
su sach » vu sach
ty hang » ty xang, thi hang, thu hang
so sach » so sanh, bo sach, co sach
cac tu » cac thu, cach tu, cac du
tu ban » thu ban, te ban
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: ((su sach) or (so sach)) ((ty hang) or (ly hang)) xa hoi. hieu van cac tu ban thanh di su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ((ty hang) OR (ly hang)) xa hoi. hieu van cac tu ban thanh di su triet.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) ((ty hang) or (ly hang)) xa hoi. hieu van cac tu ban thanh di su triet*.