search don't work

Hi i have this sample code:

$('#datatable-test').dataTable({
           
            "aoColumns": [
                            { "mDataProp": "Name" },
                            { "mDataProp": "Date" },
                            { "mDataProp": "xx" },
                            { "mDataProp": "yy" },
                            { "mDataProp": "zzz" },
                    ],
            "sAjaxSource": "/getdata",
            
            "bProcessing": true,
            "bRetrieve":true,
            "sAjaxDataProp": "xdata",
            "bAutoWidth": false,
            "sDom": '"H"lTfrtip',
    		"oTableTools": {
    			"sSwfPath": "/js/tabletools/swf/copy_csv_xls.swf",
    			"aButtons": [{
					"sExtends": "csv",
					"sFieldSeperator": ";"
    			}]
    		},
    		"bJQueryUI": true
});

when i have in column one something like this:
First Text 1
First Text 2

when i'm searching for First Text 1 i get all rows
but i went only rows with First Text 1
whats the problem here??