Hi Ricardo Julio Rodríguez Fernández.
Welcome to Microsoft Community.
In your description, it seems that the files inside one of your folders named “/Dowmloads” are not fully searchable.
I do understand the frustration and inconvenience of not being able to search for the files you need with complete accuracy through Search at this time.
You can try to make some adjustments to your search settings by following the steps below
Re-index
1 Search for “Indexing Options” in the taskbar.
2 Open it and click the Advanced button below.
3 Try to search and re-index
Then go back to the previous page, on the Indexing Options page, click the Modify button, and in the Change selected locations window, try to change your “/Downloads” folder to the one that is already checked.
Then please right-click on the Start button, select Settings, then Privacy & security, scroll down and find Searching Windows, click on it and try to set Search and Find Mode to Enhanced.
Please try the above steps and then provide me with the results.
If the problem persists, I will provide you with further assistance in terms of system fixes.
Thank you for your understanding and support.
Best regards,
Zev - MSFT | Microsoft Community Support Specialist