why i couldnt see in documents my saved notepad files although i saved it many times?

Answer 1

your computer has a thing called a clipboard.If you do not save the files to "My documents" it will be lost the next time you put something on the clipboard or shut down your computer.
2303hours

Answer 2

This could be due to the following:

You are saving to a different location. Next time, in Notepad, select file --> save as. Note down the folder where the file is saved. Using explorer, check in that folder. You should see your files.

After saving the file, use Search Options available in Start menu.