public function search_orders( $term ) {
		global $wpdb;

		/**
		 * Searches on meta data can be slow - this lets you choose what fields to search.
		 * 3.0.0 added _billing_address and _shipping_address meta which contains all address data to make this faster.
		 * This however won't work on older orders unless updated, so search a few others (expand this using the filter if needed).
		 *
		 * @var array
		 */
		$search_fields = array_map(
			'wc_clean',
			apply_filters(
				'woocommerce_shop_order_search_fields',
				array(
					'_billing_address_index',
					'_shipping_address_index',
					'_billing_last_name',
					'_billing_email',
				)
			)
		);
		$order_ids     = array();

		if ( is_numeric( $term ) ) {
			$order_ids[] = absint( $term );
		}

		if ( ! empty( $search_fields ) ) {
			$order_ids = array_unique(
				array_merge(
					$order_ids,
					$wpdb->get_col(
						$wpdb->prepare(
							"SELECT DISTINCT p1.post_id FROM {$wpdb->postmeta} p1 WHERE p1.meta_value LIKE %s AND p1.meta_key IN ('" . implode( "','", array_map( 'esc_sql', $search_fields ) ) . "')", // @codingStandardsIgnoreLine
							'%' . $wpdb->esc_like( wc_clean( $term ) ) . '%'
						)
					),
					$wpdb->get_col(
						$wpdb->prepare(
							"SELECT order_id
							FROM {$wpdb->prefix}woocommerce_order_items as order_items
							WHERE order_item_name LIKE %s",
							'%' . $wpdb->esc_like( wc_clean( $term ) ) . '%'
						)
					)
				)
			);
		}

		return apply_filters( 'woocommerce_shop_order_search_results', $order_ids, $term, $search_fields );
	}