well , I can only explain for TEFC and CACA, which can be used for one type of motor
TEFC- totally enclosed fan cooled, means for a type of motor which has a difference between inner and outer air for cooling. The motor lamination is totally closed in the stator housing and it is cooled by a flow of inner air (with rotating inner fans), and the heat exchange is through the pipes or ribs (or through water exchanger on the top). Pipes can be around the stator housing or in the heat exchanger on the top of the motor.
CACA- cooled air, cooled air - lamination is cooled with inner air (primary air), and secundary air is going through the pipes ( heat exchanger).
so, one type can be TEFC CACA....
TETV, I haven't heard about this one but totally enclosed it is....