Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh di » thanh doi, thanh de, thanh do
su sach » so sach, vu sach
ty hang » ly hang, thi hang, thu hang
duc ban » duc tan, duc van, dua ban
cua tre » cua te, cuu tre, cua triet
di cua » dai cua, doi cua, de cua

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 (ty xang)) xa hoi. hieu ((van nam) or (van lam)) duc ban thanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ty hang) OR (ty xang)) xa hoi. hieu ((van nam) OR (van lam)) duc ban thanh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ty hang) OR (ty xang)) xa hoi. hieu ((van nam) or (van lam)) duc ban thanh di cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ((ty hang) OR (ty xang)) xa hoi. hieu ((van nam) or (van lam)) duc ban thanh di cua tre*.