Tip & Tricks

 <div id="content" class="clearfix">

            <div id="main" class="col700 left clearfix" role="main">

                <h1 class="archive_title"><span>Search Results for:</span> <?php echo esc_attr(get_search_query()); ?></h1>

                <?php if (have_posts()) : while (have_posts()) : the_post(); ?>

                <article id="post-<?php the_ID(); ?>" <?php post_class('clearfix'); ?>>

                    <header>

                        <h3><a href="<?php the_permalink() ?>" rel="bookmark" title="<?php the_title_attribute(); ?>"><?php the_title(); ?></a></h3>

                        <p class="meta"><?php _e("Posted", "bonestheme"); ?> <time datetime="<?php echo the_time('Y-m-j'); ?>" pubdate><?php the_time('F jS, Y'); ?></time> <?php _e("by", "bonestheme"); ?> <?php the_author_posts_link(); ?> <span class="amp">&</span> <?php _e("filed under", "bonestheme"); ?> <?php the_category(', '); ?>.</p>

                    </header> <!-- end article header -->

                    <section class="post_content">
                        <?php the_excerpt('<span class="read-more">Read more on "'.the_title('', '', false).'" &raquo;</span>'); ?>

                    </section> <!-- end article section -->

                    <footer>


                    </footer> <!-- end article footer -->

                </article> <!-- end article -->

                <?php endwhile; ?>  

                <?php if (function_exists('page_navi')) { // if expirimental feature is active ?>

                    <?php page_navi(); // use the page navi function ?>

                <?php } else { // if it is disabled, display regular wp prev & next links ?>
                    <nav class="wp-prev-next">
                        <ul class="clearfix">
                            <li class="prev-link"><?php next_posts_link(_e('&laquo; Older Entries', "bonestheme")) ?></li>
                            <li class="next-link"><?php previous_posts_link(_e('Newer Entries &raquo;', "bonestheme")) ?></li>
                        </ul>
                    </nav>
                <?php } ?>          

                <?php else : ?>

                <!-- this area shows up if there are no results -->

                <article id="post-not-found">
                    <header>
                        <h1>No Results Found</h1>
                    </header>
                    <section class="post_content">
                        <p>Sorry, but the requested resource was not found on this site.</p>
                    </section>
                    <footer>
                    </footer>
                </article>

                <?php endif; ?>

            </div> <!-- end #main -->

            <div id="sidebar1" class="sidebar right col220">

                <?php get_search_form(); ?>



            </div>

        </div> <!-- end #content -->

This is with empty search result will return to homepage

Refer: http://wordpress.stackexchange.com/questions/29516/empty-search-returns-home-page-how-to-return-not-found-search-page