Search for words in post_type

I have a page-doctors.php with the list of doctors, these doctors are registered as post_types, the code that taking all post_type doctors is:

$paged = ( get_query_var('paged') ) ? get_query_var('paged') : 1;
                $args = array(
                    'post_type' => 'cadastro-medicos',
                    'orderby'=> 'title',
                    'order' => 'ASC' ,
                    'posts_per_page' => 10,
                    'paged' => get_query_var('paged')
                );
                query_posts($args);
                while (have_posts()) : the_post();

On that page has a form for visitors to write the doctor's name and/or medical code and search.

The difficulty is how I can search these demand information in post_type.

Can anyone help me?