FamilySearch.org's database, Brazil, São Paulo, Immigration Cards, 1902-1980, has been updated today and many Hungarian immigrants can be found arriving in São Paulo throughout this database. Searching 'Hungria' as the place of birth, which is Hungary in Portuguese, will bring back over 1,400 results for São Paulo immigrants who were born in Hungary. The content is entirely in Portuguese, so you will need to ready your dictionaries and Google Translate. The best part? Most have pictures of the individuals! I particularly like José Furst's fun tie in his picture.
There is the chance that you will run into spelling variations because of the language differences, such as with this example of the widowed Etelka Izsó's immigration card that was filed in 1920. Her name appears as Etelko Izso and her parent's names as Antol Izso and Lidia Tokoic. Anyone familiar with Hungarian genealogy would know that Antol is correctly spelled as Antal and that her mother's surname was likely originally spelled as Takács.
What I have garnered from the Hungarian results in this database, is that it appears a good deal of the immigrants had arrived during the 1940's-1970's and many as 'stateless'. It's clear that these immigrants were fleeing Hungary because of the communist and Soviet Union hold over Hungary and the Hungarian People's Republic.