Do you have a folder named Windows.old, on your computer?
If so, for security, first, right click it and copy it (NOT move) to a safe place - another partition or an external device.
You can then browse through the folder and see if your private documents are in there.
I don't understand your posted method of using "find". If you look to the left of the taskbar, there is a icon for the search facility. Try typing the name of one of your documents in there and see if you get a result.