It's possible that:
* The title is misspelled: You might have a typo in the title. Try checking the spelling and searching again.
* It's a lesser-known film: It might be a film that's not widely known or documented.
* You're looking for information about a specific Finnish film: "Jazzista puheenollen" sounds like it could be a Finnish film title. Try searching for Finnish films from 1968.
Please provide more information so I can help you find the actors and actresses you are looking for.