Tsankov published theological books and took part in lectures at home and abroad.
He describes Orthodox Christian worship the following way: In the liturgy of the Orthodox Church ... are doctrine and experience, symbol and reality, history and present, God and man united .
[1] Through the results of his theological research, he was given a professorship at Sofia University in Bulgaria.
He was a member of the Christian Peace Conference and worked in Prague at his First and Second Meetings in 1958 and 1959.
[2] On the occasion of the 120th anniversary of the University of Sofia and the 85th anniversary of its Theological Faculty, an international conference in memory of Stefan Tsankov was held.