After resetting my phone back to factory I tried to locate and recover my documents from clipboard it wasn't there I've been searching and I just could not find it I did save them on clipboard
The clipboard is transient - as soon as you copy or cut something else, what was in there is replaced. When you reset or restart the phone, anything in there disappears. ("The clipboard" is only a part of |RAM set aside to copy, cut and paste to and from.) If you want a clipboard that keeps what you put into it, use an app like Clipper - Clipboard Manager - it maintains its own "clipboard" as a file, that persists through restarts. (Nothing persists through a factory reset except Android and system apps.)