Innovating teaching methods is one of the most important current tasks of Vietnam’s education and training industry. Resolution of the 8th Conference of the Central Committee of the Communist Party of Vietnam, Term XI, affirms: “Continue to strongly innovate teaching and learning methods in a modern direction
promote positivity, initiative, and creativity. create and apply knowledge and skills of learners
overcome one-way imposed transmission and mechanical memorization”. There are many active teaching methods, but the puzzle technique in teaching is collaborative, combining individuals, groups and connections between groups to solve a complex task, stimulating participation. Actively as well as enhance the role of individuals in the cooperation process.