It might seem tough to find high-growth stocks in an aging bull market. However, there are still plenty of attractive stocks in the cloud, online travel, and business services industries. Today, three of our Motley Fool contributors will share their favorite high-growth plays in those markets: Veeva Systems (NYSE: VEEV), Booking Holdings (NASDAQ: BKNG), and Cintas (NASDAQ: CTAS).Leo Sun (Veeva Systems): Veeva Systems provides cloud services for the healthcare industry.