Display the result of the search bar in codeigniter - php

Question

Good day to all I have trouble in codeigniter it suppose to display the data (the first name and the student id of the student) in my oracle database depending on what I type in the search box. for example i the the name of student to the search box when i click the submit button it will display the data of that student. i try to search some code and use it but it displayed error 404 page not found. here is the code
This is for the view mysearch.php
<form action="<?php echo site_url('search/search_keyword');?>" method = "post">
<input type="text" name = "keyword" />
<input type="submit" value = "Search" />
</form>
This is for the controller search.php
Class Search Extends CI_Controller
{
function __Construct()
{
parent::__Construct();
$this->load->database();
$this->load->model('mymodel');
}
function search_keyword()
{
$keyword = $this->input->post('keyword');
$data['results'] = $this->mymodel->search($keyword);
$this->load->view('result_view', $data);
}
}
This is for the Model mymodel.php
Class Mymodel Extends CI_Model
{
function __construct()
{
parent::__construct();
}
function search($keyword)
{
$this->db->like('name',$keyword);
$query = $this->db->get('tablename');
return $query->result();
}
}
This is for the view result_view.php
<table>
<?php
foreach ($results as $row) {
?>
<tr>
<td><?php echo $row->FIRST_NAME?></td>
<td><?php echo $row->STUDENT_ID?></td>
</tr>
<?php
}
?>
</table>