Through the 1940s he worked on his first book , '' Phenomenology and Dialectical Materialism '' , and his ideas achieved some currency among the elite philosophical circles of France .
Through the 1940s he worked on his first book , '' Phenomenology and Dialectical Materialism '' . 
 In the 1940s and 50s Tran Duc Thao 's ideas achieved some currency among the elite philosophical circles of France .