Please, help what is wrong

Please help this is not properly working

$result=mysqli_query($db,"SELECT * FROM network_switches");

                            while ($row = mysqli_fetch_array($result)) {


                            $result_1=mysqli_query($db,"SELECT * from voice_guides ");
                            if(mysqli_num_rows($result_1) > 0 ){
                            while ($row_1 = mysqli_fetch_array($result_1)) {    
                            ?>

                            <br><br>                
                            <?php echo $row['switches_name']; ?>    
                            <?php echo $row_1['presedure']; ?>



                            <?php
                            }
                            }
                        }