how to set columns for search datatables jquery

how to set columns for search datatable jquery? i use datatables and my problem is filter multi columns.

i am trying filter all columns in DataTables but only last field send to server for filtering.

function searchRow(selector, formName) {
    var $formId = $('#' + formName + 'Form');
    var formData = new FormData( $formId[0] );
    for (var pair of formData.entries()) {
        table.column(pair[0]).search(pair[1]);
    }
    table.ajax.reload();
}