Empty site search result

This is the code:

if($_GET['find']){ $text=$_GET['text']; $text=preg_replace("#[^0-9a-z]#i","",$text); $query=mysql_query("SELECT * FROM student WHERE username LIKE '%$text%' OR surname LIKE '%$text%' OR name LIKE '%$text%' OR lastName LIKE '%$text%'") or die("netu"); $count=mysql_num_rows($query); if($count==0){ echo "<h2 style='font-size:22px;'>Ничего не найдено!</h2>"; }else if($count!=0){ while($row=mysql_fetch_array($query)){ $login=$row['username']; $surname=$row['surname']; $name=$row['name']; $lastName=$row['lastName']; echo "<tr>"; echo "<td class='num'>1</td>"; echo "<td class='log'><a href='../profile.php?=".$_GET['id']."'>".$login."</a></td>"; echo "<td class='fio'><p>".$surname." ".$name." ".$lastName."</p></td>"; if($admin){ echo "<td class='action'><a href='../deleteProfile.php'>Удалить</a></td>"; } echo "</tr>"; } }else{mysql_error();} } 

And this code searches for once, that is, the first time it is found, but if you try to find anything again, it returns the site without data, but the design remains