Genealogy Slonim and Bereza

Hello

I am doing my family genealogy. And I have found information in line with the “great great grandfather” and “the great great grandmother”.
The “great great grandfather” is called Mowsza Menachem Epsztejn (Мовша Менахемъ ЭПШТЕЙНЪ). He was born in Slonim in the year 1845-1846.
The “great great grandmother” is called Szajna-Frajda Cemelinska (Шайна-Фрайда ЦЕМЕЛИНСКАЯ). She was born in Bereza (Bioaroza) between 1855 and 1858.
I know that they did not live all life in these places, since they should have been arrived in Warszawa before 1880 (the birth date of my first brother of my great grandfather)

I would like to know if it is possible to find and access information in Belarus Archives or Grodno Province Archives. I did not success to find information or data that could guide my search in the Jews census records.

Thank you very much in advance for your help

David.C