Perhaps you should try some spelling variations:
thanh doi » thanh loi, thanh moi, thanh do
thanh di » thanh de, thanh do, thanh dinh
su sach » so sach, vu sach
tuc van » thuc van, truc van, tuc va
dau tuc » dau tu, dao tuc, cau truc
ly vang » ly hang, ly van, ly quang
cuu tre » cua tre, cau tren, cau treo
va dau » va dao

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 ((ly vang) or (ty xang)) xa hoi. lieu va dau tuc van ((thanh di) OR (thanh doi)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ly vang) OR (ty xang)) xa hoi. lieu va dau tuc van ((thanh di) OR (thanh doi)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ly vang) or (ty xang)) xa hoi. lieu va dau tuc van ((thanh di) OR (thanh doi)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: su sach ((ly vang) or (ty xang)) xa hoi. lieu va dau tuc van ((thanh di) OR (thanh doi)) cuu tre*.