At this point, both "dark matter" and "dark energy" are really only theoretical place holders in our theories, needed to make the theories fit the observations. Theorists have been free to assume that each does exactly what is needed to make the fits, without doing anything else that would mess-up the fits.
Experiments to detect, or if not detect, limit the range of potential parameters for dark matter and dark energy candidates have so far just made the limits somewhat tighter, without any real detections.
All we can really say at t his point is that "something" is making our observations differ from our expectations based on the physics that we understand, and use the "dark" names for those "somethings", until we actually find something - or realize that we have been missing something important in the theories.
At this point, I think we are going to need a bigger telescope.