Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thanh do » thanh de, thanh pho, thanh hoa
su sach » so sach, vu sach
dao tuc » dao duc
dau tuc » dau tu, cau truc, dau nuoc
ty hang » ly hang, thi hang, thu hang
cuu tre » cua tre, cau tren, cau treo
do cuu » do huu, do cua, ho cuu

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