Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thanh di » thanh doi, thanh de, thanh do
su sach » so sach, vu sach
dao tuc » dao duc
dau tuc » dau tu, cau truc, dau nuoc
ly vang » ly hang, ly van, ly quang
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 ((ly vang) or (ty xang)) xa hoi. lieu va ((dau tuc) OR (dao tuc)) van thanh di cua 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) OR (dao tuc)) van thanh di cua 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) OR (dao tuc)) van thanh di cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ((ly vang) or (ty xang)) xa hoi. lieu va ((dau tuc) OR (dao tuc)) van thanh di cua tre*.