How can I recover missing notes after re-logging in to iCloud?

Re: "I logged out of my Apple ID on my iPhone and found that all my documents in Apple Notes were gone. Then I logged back in and most of my documents files reappeared, but some were still missing. And I have tried to view on iCloud which is still incomplete. What can I do?

You may want to first check the "Recently Deleted" folder to see if you can recover your Notes from there:

As "you store your notes on iCloud, check your Recently Deleted folder:

1. Open Notes, then tap the back icon until you see your Folders list.
2. Tap Recently Deleted and search for your note.

If you find your note in Recently Deleted or in another folder, you can move it:

1. In the Notes list, tap Edit.
2. Select the note that you want to move.
3. Tap Move, then select the folder you want to move it to.
4. If you use notes with another service, like Gmail or Yahoo, check the Trash folder of that account in the Mail app. If you delete a note from the Notes app, your third-party account will usually keep it in the Trash folder. To recover a note from the Trash folder, you need to copy and paste the note to a new note in the Notes app."

Above is from: If you're missing notes on your iPhone, iPad, or iPod touch - Apple Support

If needed: You can view the complete article online for other tips.