How can I add multiple conditions for the same field taxonomy term in views query?
you try this code:

$and = $query-&gt;andConditionGroup();
foreach($ch_id as $key =&gt; $val_array){
   $and-&gt;condition('node__field_characs.field_characs_target_id', $val_array, 'IN');
}

$query-&gt;condition($and);