http://domain/support/search/?s=yes&post_type=help

RewriteRule ^port/?$ index.php [QSA,L]

BuddyPress
Clone Posts
Contact Form 7
Easy Bootstrap Shortcode
Easy Pricing Tables Lite by Fatcat Apps
HubSpot for WordPress
jQuery Smooth Scroll
Module Manager
Simple Share Buttons Adder
Types - Complete Solution for Custom Fields and Types
WooCommerce
WordPress Importer
WordPress SEO
WP Migrate DB
WP Views

function rm_search_rule(){
    add_rewrite_rule('^support/search/', 'index.php', 'top');
}
add_action( 'init', 'rm_search_rule' );

function rm_search_rule(){
    add_rewrite_rule('^support/search/([^/]+)', 'index.php?s=$matches[0]', 'top');
}
add_action( 'init', 'rm_search_rule' );