I need help adding thumbnail to search results in twenty-eleven theme

Do not edit the theme itself. First create a child theme for your changes and create your own search.php template file.

Yes I do use a child theme, thanks for the reminder to only change the child.

can you or someone direct me where I can discover functions and how to use the search.php file to load thumbnail sizes images of the posts?

currently my search.php is as follows:

<?php
/**
 * The template for displaying Search Results pages
 *
 * @package WordPress
 * @subpackage Twenty_Twelve
 * @since Twenty Twelve 1.0
 */

get_header(); ?>

	<section id="primary" class="site-content">
		<div id="content" role="main">

		<?php if ( have_posts() ) : ?>

			<header class="page-header">
				<h1 class="page-title"><?php printf( __( 'Search Results for: %s', 'twentytwelve' ), '<span>' . get_search_query() . '</span>' ); ?></h1>
			</header>

			<?php twentytwelve_content_nav( 'nav-above' ); ?>

			<?php /* Start the Loop */ ?>
			<?php while ( have_posts() ) : the_post(); ?>
				<?php get_template_part( 'content', get_post_format() ); ?>
			<?php endwhile; ?>

			<?php twentytwelve_content_nav( 'nav-below' ); ?>

		<?php else : ?>

			<article id="post-0" class="post no-results not-found">
				<header class="entry-header">
					<h1 class="entry-title"><?php _e( 'Nothing Found', 'twentytwelve' ); ?></h1>
				</header>

				<div class="entry-content">
					<p><?php _e( 'Sorry, but nothing matched your search criteria. Please try again with some different keywords.', 'twentytwelve' ); ?></p>
					<?php get_search_form(); ?>
				</div><!-- .entry-content -->
			</article><!-- #post-0 -->

		<?php endif; ?>

		</div><!-- #content -->
	</section><!-- #primary -->

<?php get_sidebar(); ?>
<?php get_footer(); ?>

I would like to add like a 150×150 pixel thumbnail of the featured image after the page title in the results

also looking to do something similar, if you found a solution let me know?

thanks

Still stumped, I do have a child theme already installed, do you know where I can find a template or examples of search.php files with the photo thumbnail showing for the results that I could use as an example to build off of?