functions.php

<?php
add_action( 'pre_get_posts', 'my_pre_get_posts' );
function my_pre_get_posts( $query ) {
	if ( ! $query->is_main_query() )
		return;
		
	$woo_search = woo_dynamic_search_header();
	if ( isset( $woo_search['query_args'] ) )
		foreach ( $woo_search['query_args'] as $key => $value )
			$query->set( $key, $value );
}