Hello dibixsrl.

1) Filters are currently set up to use "OR" with select and check-boxes. You can see this in ../wp-content/plugins/wpdatatables/source/class.wpdatatable.php around line 1681:

$j = 0;
    $search .= " (";
    foreach ($checkboxSearches as $checkboxSearch) {
      if ($j > 0) {
         $search .= " OR ";
    }

If you need to change it from "OR" to "AND", simply modify that so it looks like this:

$j = 0;
    $search .= " (";
    foreach ($checkboxSearches as $checkboxSearch) {
      if ($j > 0) {
         $search .= " AND ";
    }

2) Unfortunately, at the moment, the values are being read in the order they appear in the table, and to get the to appear alphabetically you would need to enter them manually one by one.

You're welcome to take a look at our hooks and filters and see if there's anything that could help you out there.

Please note that using hooks requires certain level of programming skills and included support refers only to advice.

Best regards.