Micro speech tensorflow light example

I am trying to run this example code "micro speech"in arduino using Aruino 33 ble board and I am able to get output for "yes" and "no" but I am not able to get output for "on" and "off" , the model does not response to any words in this case.
I have done required changes as suggested in TinyML book but then also result is not there.
Can you please help in this regard?