There's a workaround to see topics that have been moved to the trashcan, if you know the url of a thread that has been moved to trashcan, put cache: in front of it.
For example: cache:bitcointalk.org/index.php?topic=topicthathasbeenmovedtotrash
You can now read the thread!
If the thread was moved to the trashcan ten minutes after the creation ? I do not think that Google has saved a copy of it , or am I wrong?