If you know a thread that was moved to the trash can and for whatever reason you want to read it again, and if you can remember the thread name, search the thread name up on google/find the thread in your history, get the link, and put cache: in front of the link.
As so:
The thread I wanted to read again was "VodPonzi" it was a scam but it was funny.
Here is the link:
https://bitcointalk.org/index.php?topic=935519.0As you can see, it was moved to the trash so you can't read it. Put cache: in front of the link as so:
cache:https://bitcointalk.org/index.php?topic=935519.0
You can now read the thread.