Why has no spacecraft come back from Venus?

There are different reasons for this. There is a lot of spacecraft that become inflated the moment that they hit Venus. Those who get to that planet can only provide information for a certain period of time before the people lose contact with them. It is also quite a challenge to re-enter our planet again. It will be easy to go fast.

The only issue with this is that the spacecraft can become too fast that it might burn up. Another possible option is to go slowly but the earth can have a tricky atmosphere to maneuver. It would take a really skilled pilot in order to make re-entering possible. There are still some innovations that are being done by those in NASA in order to have the type of items that people need to enter Venus again.