woocommerce product search based only title

add below code on function.php file in your theme directory .

<?php
    function __search_by_title_only( $search, &$wp_query )
    {
        global $wpdb;
        if ( empty( $search ) )
            return $search; // skip processing - no search term in query
        $q = $wp_query->query_vars;
        $n = ! empty( $q['exact'] ) ? '' : '%';
        $search =
        $searchand = '';
        foreach ( (array) $q['search_terms'] as $term ) {
            $term = esc_sql( like_escape( $term ) );
            $search .= "{$searchand}($wpdb->posts.post_title LIKE '{$n}{$term}{$n}')";
            $searchand = ' AND ';
         }
         if ( ! empty( $search ) ) {
             $search = " AND ({$search}) ";
             if ( ! is_user_logged_in() )
                 $search .= " AND ($wpdb->posts.post_password = '') ";
              }
          return $search;
      }
    add_filter( 'posts_search', '__search_by_title_only', 500, 2 );
?>