Madrid-Beijing-Hanoi return ticket

Hi, i wonder if we are eligible for 144 h visa two times if we fly Madrid - beijing (20 h stopover) -Hanoi and 2 weeks later we fly back Hanoi-Beijing(14h stopover) -Madrid, I understand we fly to a 3rd country, but our second time we come from the same country and I am not sure if that is considered return ticket to Beijing. We have all flights in one single booking. Thanks for your help!