Field Search

Hi, I made a page that searches the products registered and then the results appear on the page resultados.php.

I would like the results.php page to be able to make a more exact query as soon as the lower price appears first, to have the option to choose the new or used product, to appear physical or legal person.

I put my code in pastebin: link

<?php include 'header.php'; ?>

<header class="docs-top">
    <div class="container docs-header">
   Todos os resultados
 </div>
</header>
<section>
  <div class="container">

    <?php 
    require 'conexao.php';

    $produto = $_POST['produto'];
    $sql = mysql_query("SELECT * FROM usuario where produto LIKE '%".$produto."%' ");

    // SELECT preco FROM usuario ORDER BY preco ASC

    $row = mysql_num_rows($sql);
    if ($row > 0) {
      while ($linha = mysql_fetch_array($sql)) {
        $produto = $linha['produto'];
        $bairro = $linha['bairro'];
        $preco = $linha['preco'];
        $telefone = $linha['telefone'];
        $nome = $linha['nome'];
        $estado = $linha['estado'];
      }
    } else {
      echo "Nenhum resultado encontrado";
    }
    ?>


    <div class="well recomentadion clearfix">
      <h1>Pesquisar</h1>
      <form action="" method="POST">     
        <fieldset>
          <div class="form-group col-md-3">
            <label class="" for="advertisement">Título do Anúncio </label>                
            <div class="control mr-30">
              <input type="text" id="title" name="title" class="form-control" value="" placeholder="Título" data-original-title="" title="">
            </div>
          </div>                  

          <div class="form-group col-md-3">
            <label class="" for="advertisement">Novo/Usado</label>                
            <div class="control mr-30">
              <select class="form-control">                               
                <option>Novo</option>
                <option>Usado</option>
              </select> 
            </div>
          </div>

          <div class="form-group col-md-3">
            <label class="" for="advertisement">Empresa/P. fisica</label>                
            <div class="control mr-30">
             <select class="form-control">
              <option>Todos</option>
              <option>Empresa</option>
              <option>Pessoa fisica</option>
            </select> 
          </div>
        </div>

        <div class="form-group col-md-3">
          <label class="" for="advertisement">Ordernar por Preço</label>                
          <div class="control mr-30">
            <select class="form-control">
              <option>Menor preço</option>
              <option>Maior preço</option>                               
            </select>  
          </div>
        </div>  

        <div class="clear"></div> 
        <input type="submit" style="margin-top:20px;" name="submit" class="btn btn-primary pull-right" value="Pesquisar"> 
      </fieldset>
    </form>
  </div>

  <!-- produto -->

  <div class="bs-docs-example">
    <table class="table table-bordered">
      <tbody>
        <tr>
          <td align="center">:<img src="http://wcloudstatic.s3.amazonaws.com/img/no_image.jpeg"width="150" height="150" /></td>                 
          <td><?php echo ".$produto"; ?> <br><br> <?php echo ".$bairro"; ?> - <?php echo ".$estado"; ?><br> <?php echo ".$nome"; ?> - <?php echo ".$telefone"; ?></td>
          <td><?php echo ".$preco"; ?></td>
        </tr>          
      </tbody>
    </table>    
  </div>

  <!-- /produto -->

</div>

</section>

<?php include 'footer.php'; ?>