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
tuc ban » thuc ban, truc ban, tu ban
dau tuc » dau tu, dao tuc, cau truc
ty lang » tay lang, ty hang, tu lang
bo sach » co sach, hoc sach
cuu tre » cua tre, cau tren, cau treo
va dau » va dao
di cuu » di cau, di cua, dinh cuu

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: ((su sach) OR (bo sach)) ((ty lang) OR (ty xang)) xa hoi. lieu va dau tuc ban thanh di cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (bo sach)) ((ty lang) OR (ty xang)) xa hoi. lieu va dau tuc ban thanh di cuu tre~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (bo sach)) ((ty lang) OR (ty xang)) xa hoi. lieu va dau tuc ban thanh di cuu tre*.