Make it possible to serach in all versions of files

Minutes from meetings are stored in a new version as the meetings persist. In my case, I now have 66 versions of the minutes for a project period. I am trying to find a case that was dealt with in an earlier meeting, but I don't think the search engine is searching through all versions of the file. As the cases are decided, the case is removed from the new version of the document. The case ended in a version between 10 and 30 of the document, I think. Do I have to print all versions of the document to search manually through all paper sides of the versions, or is there a search option where the words of case could be searched for in all 66 versions? It is only in the last meeting record that the case appears, because this came up for treatment in the last meeting. How can I find the information in earlier versions of a Word file? Other solution: I have to save all documents as a new file for every revision?? Where is Watson?