search option not working when adding another select box while clicking but

below is my php and html code

<div id="entry1" class="clonedInput">
                                       <h3 id="reference" name="reference" class="heading-reference"></h3>    
                                     <div id="domain_section" class="notranslate">

                                      <div class="form-group">
                                        <label class="col-md-3 control-label label_pro" for="inputDefault">Product:</label>
                                        <div class="col-md-6" >

                                       <select  class="form-control populate select_pro" name="select_pro[]"  id="select_pro"  data-plugin-selectTwo >
                                                     <?php
        //`product_id`, `product_name`, `quantity`, `cat_id`, `banner`, `desc`SELECT * FROM `products`
    $get_scategory = mysql_query("select * from products") or die(mysql_error());
    $count_subcategory = mysql_num_rows($get_scategory);

        if($count_subcategory > 0 ) {
        ?>
         <option value="">Select product</option>
         <?php
            while($scategory_detail = mysql_fetch_array($get_scategory)) {
                $product_id = $scategory_detail['product_id'];
                $product_name = $scategory_detail['product_name'];
        ?>

            <option value="<?php echo $product_id ; ?>"><?php echo $product_name ; ?></option>
            <?php
            }
            }
            ?>
        </select>


                                    <!--  <select data-placeholder="Choose a Product" name="treatment1" id="prdt_scategory" class="prdt_scategory">
                         <option value="">Choose Product</option>
                         </select>-->
                                        </div>
                                    </div>
                                    </div>



                                    <div class="form-group">
                                        <label class="col-md-3 control-label" for="inputDefault">or</label>

                                    </div>



                                      <div class="form-group">
                                        <label class="col-md-3 control-label" for="inputDefault">Product </label>
                                        <div class="col-md-6">
                                            <input type="text" class="form-control select_prot" id="inputDefault" name="select_prot[]">
                                        </div>
                                    </div>


                                      <div class="form-group">
                                        <label class="col-md-3 control-label" for="inputDefault">Quantity </label>
                                        <div class="col-md-6">
                                            <input type="text" class="form-control select_qty" id="inputDefault" name="select_qty[]">
                                        </div>
                                    </div>

                                      <div class="form-group">
                                        <label class="col-md-3 control-label" for="inputDefault">Amount</label>
                                        <div class="col-md-6">
                                            <input type="text" class="form-control select_amt" id="inputDefault" name="select_amt[]">
                                        </div>
                                    </div>

                                    </div>

and my jquery code is

<script>
$(function () {
    $('#btnAdd').click(function () {
        var num     = $('.clonedInput').length, // how many "duplicatable" input fields we currently have
            newNum  = new Number(num + 1),      // the numeric ID of the new input field being added
            newElem = $('#entry' + num).clone().attr('id', 'entry' + newNum).fadeIn('fast'); 

         newElem.find('.select_pro').attr('id', 'ID' + newNum + '_pro').attr('name', 'select_pro[]').val('');

         newElem.find('.select_prot').attr('id', 'ID' + newNum + '_prot').attr('name', 'select_prot[]').val('');

         newElem.find('.select_qty').attr('id', 'ID' + newNum + '_qty').attr('name', 'select_qty[]').val('');

        newElem.find('.select_amt').attr('id', 'ID' + newNum + '_amt').attr('name', 'select_amt[]').val('');

        $('#entry' + num).after(newElem);
        $('#btnDel').attr('disabled', false);


    });

    $('#btnDel').click(function () {
                var num = $('.clonedInput').length;
                $('#entry' + num).slideUp('fast', function () {$(this).remove(); 
                    if (num -1 === 1)
                $('#btnDel').attr('disabled', true);
                $('#btnAdd').attr('disabled', false).prop('value', "+");});

        return false;
        $('#btnAdd').attr('disabled', false);
    });

    $('#btnDel').attr('disabled', true);

});
</script>

after clicking button i am getting select box but search option not working