Linking searches together in php

I want to link searches from a checkbox form together. E.g i have 5 checkboxes (a,b,c,d,e) if i have checked a and b, i want to search depending on what i have searched i.e display two different results.

 <form role="form" action="R.php" method="post">
  <div class="form-group">
  <input type="checkbox" value="a" name="search" />a

    <input type="checkbox" value="b" name="search" />b

      <input type="checkbox" value="c" name="search" />c

        <input type="checkbox" value="d" name="search" />d

          <input type="checkbox" value="e" name="search" />e
          </div>
  <input class="btn btn-default glyphicon-align-right" type="submit" value=">>"/>
  </form>

The PHP

 <?php $output='';

if(isset($_POST['search'])){
$searchq=$_POST['search'];
$searchq = preg_replace ("#[^0-9a-z]#i","",$searchq);   

$Squery = mysql_query("SELECT * FROM database WHERE Name LIKE '%$searchq%'");


$count = mysql_num_rows ($Squery);

    echo "<div id=results><ul class=list-group><div id=qwerty>";
if($count == 0){
$output = 'There was no results!';
}else{

    while($row = mysql_fetch_array($Squery)){
        $name = $row ['Name'];
        $id  = $row['ID'];
        $category = $row['Category'];
        $output .='<div class="container">'.$name.$category.'       '.$id.'</div>';

        echo  "<li>"."<div style=height:95px ><h3 class=text-center style=text-transform:capitalize >".$name.' '."</h3></div>".
        "<div>"."<a href=n.php><img src=images/$id.jpg alt=Image /></a>
                    </div>".



        ' '.$category.' RESULT!!!!!'.$id."</li>";



    }
        echo "</div></ul></div>";
}
}
?>