I can't find unity game text files?

I use AssetsStudioGUI to find a unity game text file but when i tried, i find too much MonoBehaviour file but there was no text file in any of them. I find just a JSON text like:

{
  "m_GameObject": {
    "m_FileID": 0,
    "m_PathID": 12
  },
  "m_Enabled": 1,
  "m_Script": {
    "m_FileID": 1,
    "m_PathID": 8674
  },
  "m_Name": ""
}

and all MonoBehaviour files are full of stuff like this. Where do I find the actual text files for the game?