I think in general classical guitars don't have truss rods, at least they didn't use to have. Acoustic and electro/acoustic guitars that have metallic strings have truss rods but classic guitars have nylon string and theoretically don't need one. But I am not 100% sure on modern classical guitars!
Nylon strings are lower tension than steel strings so classical guitars don't necessarily need truss rods. It's far more common to find classical guitars for sale without truss rods than it is to find ones with them.