Page not found when my submitting my php form - php

Question

i have this form i built using php the form is supposed to search for a user in formation in my database, but when i fill in the search box and click ok it will try to load process.php instead of the search.php i assigned it to redirect to and for that reason it shows me "PAGE NOT FOUND" *** and for the refrence it is a wordpress plugin that i want to use on my website that i am trying to build
this is the code
add_action( 'admin_menu', 'addAdminMenu' );
function addAdminMenu(){
add_menu_page('ClassifiedBr Settings', 'ClassifiedBr', 'manage_options', 'classifiedbr_settings_page', 'classifiedbr_init', '', 3);
add_submenu_page('classifiedbr_settings_page','Classified Sub', 'Classified Sub','manage_options', 'classified_sub_slug', 'stracking_init');
}
function classifiedbr_init(){
echo '<form action="demo.php" method="post" />';
echo "<h1>Britchi Tracking</h1>";
echo '<p>';
echo 'Costumers Name (required) <br/>';
echo '<input type="text" name="cname" placeholder="Emmanuel John"/>';
echo '</p>';
echo '<p>';
echo 'Tracking number (required) <br/>';
echo '<input type="text" name="ctracking" placeholder="EEX28PDS"/>';
echo '</p>';
echo '<p>';
echo 'Email (required) <br/>';
echo '<input type="email" name="cemail" placeholder="Email"/>';
echo '</p>';
echo '<p>';
echo 'Recived Port (required) <br/>';
echo '<input type="text" name="crport" placeholder="Brazil Port"/>';
echo '</p>';
echo '<p>';
echo 'Delivered Port (required) <br/>';
echo '<input type="text" name="cdport" placeholder="Lagos Port"/>';
echo '</p>';
echo '<p>';
echo 'Current Location (required) <br/>';
echo '<input type="text" name="clocation" placeholder="Abuja" />';
echo '</p>';
echo '<p>';
echo 'Destination (required) <br/>';
echo '<input type="text" name="cdestination" placeholder="Total filling Station, Abuja"/>';
echo '</p>';
echo '<p><input type="submit" name="cregistered" value="Register"></p>';
echo '</form>';
}
function stracking_init(){
echo '<form action="search.php" method="post" />';
echo "<h1>Britchi Tracking</h1>";
echo '<p>';
echo 'Costumers Name (required) <br/>';
echo '<input type="text" name="search" placeholder="Emmanuel John"' . '" size="70"/>';
echo '</p>';
echo '<p><input type="submit" name="csearch" value="Search"></p>';
echo '</form>';
}
add_shortcode('TRACSEARCH', 'stracking_init');
?>
in this code I have 2 forms the first one (classifiedbr_init)sending to demo.php and the second one (strackinh_init) sending to search.php
as you can see the classifiedbr_init and the stracking_init functions will show on the admin page but only the stracking_init will show on the the frontend becouse i created a shortcode for it
this is the search.php code
<table border="">
<tr>
<th>Firstname</th>
<th>Lastname</th>
<th>Email</th>
<th>RecivedPort</th>
<th>DestinationPort</th>
<th>Location</th>
<th>Destination</th>
</tr>
<?php
$conn=mysqli_connect("localhost","root","","class");
$set=$_POST['search'];
if($set) {
$show="SELECT * FROM demo where fname='$set'";
$result=mysqli_query($conn, $show);
while($rows=mysqli_fetch_array($result)) {
echo "<tr>";
echo "<td>";
echo $rows['cname'];
echo "</td>";
echo "<td>";
echo $rows['ctracking'];
echo "</td>";
echo "<td>";
echo $rows['cemail'];
echo "</td>";
echo "<td>";
echo $rows['crport'];
echo "</td>";
echo "<td>";
echo $rows['cdport'];
echo "</td>";
echo "<td>";
echo $rows['clocation'];
echo "</td>";
echo "<td>";
echo $rows['cdestination'];
echo "</td>";
echo "</tr>";
echo "</br>";
}
}
else{
echo "nothing found";
}
?>
</table>
thanks as you help me out