Perhaps you should try some spelling variations:
xa thanh » va thanh, ha thanh, ta thanh
thanh di » thanh doi, thanh de, thanh do
cua viet » ca viet, hoa viet, cua vat
su sach » so sach, vu sach
ty hang » ty xang, thi hang, thu hang
ly hang » ly quang
hieu ve » hieu va, hieu van
ve cac » va cac, vien cac
cac tu » cac thu, cach tu, cac du
di cua » dai cua, doi cua, de cua
tu xa » tu xay, tu va, te xa

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 ((ty hang) or (ly hang)) xa hoi. hieu ve cac tu xa thanh di cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ty hang) OR (ly hang)) xa hoi. hieu ve cac tu xa thanh di cua viet.
• Adding a wildcard symbol may retrieve word variants: su sach ((ty hang) or (ly hang)) xa hoi. hieu ve cac tu xa thanh di cua viet*.