Many universities of education in Vietnam have a long history of development, following the French ENS model. In this model, the training of teachers in general, and Math teachers, in particular, focuses mainly on pure mathematical knowledge. During the past ten years, with the pressure of change from the Ministry of Education and Training, professional training has been receiving more and more attention. The proportion of subjects related to Education and Math Education has been increasing, although it is still small compared to the proportion of pure Mathematics modules. In this context, Ho Chi Minh City University of Education decided to observe student teachers' teaching practice during the practicum in high schools. In order to analyze this practice, a model has been developed, a collaboration model of various stakeholders. Data were then analyzed using supervisors’ reports. The results show that there is an improvement in the level of involvement of lecturers as supervisors in this collaborative model.