There were multiple Bengali productions titled Omanush or Amanush released in 2022:
: A tag traditionally indicating a high-quality "rip" originally sourced from the now-defunct release group or tracker of the same name. mlsbd-shop-omanush-2022-rarbghd-bar-bengali-1080p-mkv
The string you provided, is not a scholarly topic but a specific file naming convention used for pirated digital media. There were multiple Bengali productions titled Omanush or