You want to build an Arduino Bluetooth Car that can be controlled from your smartphone, or you want to build a remote control robot via Bluetooth? Arduino Remote LITE is the best choice. The full instruction and sample code are provided in this tutorial. You can upgrade the source code to build anything you want. Especially, all command can but customized easily in Gamepad Mode.
You can convert this in to Voice Control version easily with Voice Command mode. Just add a Dictionary that contains all the commands from Gamepad mode and have fun!