search in server-side datatable

1) DataTables zero configuration example (http://datatables.net/release-datatables/examples/basic_init/zero_config.html)
search string: "win nav"
result - 1: "Gecko Netscape Navigator 9 Win 98+ / OSX.2+ 1.8 A"
2) DataTables server-side processing example (http://datatables.net/release-datatables/examples/data_sources/server_side.html)
search string: "win nav"
result - nothing..
I have this problem also on my server (use json).