My problem is about missing the messages from the labeling. I have a organized labels in my Gmail account but some old messages have no label. I want to find and add them proper labels.
Assuming you want find messages that don't have any of the labels you've created, it's as simple as a search for:
If you want to find all messages that don't have any label at all, not even the system labels, try searching for
has:nouserlabels -in:inbox -in:spam -in:trash
This last will give you any message that doesn't have any of your labels and is not in your inbox, spam folder, or deleted messages.