Does emptiness & no-self work together?

Emptiness seems to be very prevalent in Dhamma after Theravada. But I have seen that it still exists in Theravada, it has just been ignored compared to other teachings. Why is emptiness ignored so much in Theravada & can emptiness be harmonious alongside the teaching of no-self? If my question is not clear, please inform me. :) Metta to all!