WordPress at a glance
filter is not described

woocommerce_shop_order_search_results filter-hook . WC 1.0

Usage

add_filter( 'woocommerce_shop_order_search_results', 'filter_function_name_4231', 10, 3 );
function filter_function_name_4231( $order_ids, $term, $search_fields ){
	// filter...

	return $order_ids;
}
$order_ids
-
$term
-
$search_fields
-

Where the hook is called

WC_Order_Data_Store_CPT::search_orders()
woocommerce_shop_order_search_results
woocommerce/includes/data-stores/class-wc-order-data-store-cpt.php 561
return apply_filters( 'woocommerce_shop_order_search_results', $order_ids, $term, $search_fields );

Where in WP core the hook is used WooCommerce

woocommerce/includes/tracks/events/class-wc-orders-tracking.php 24
add_filter( 'woocommerce_shop_order_search_results', array( $this, 'track_order_search' ), 10, 3 );