SharePoint Online doesn't return search results

Hey! So, I use SP Online and my search bar was working fine. Now, I can't search some items in my list and if I search in the hole website they don´t appear to.

I followed this link and everything was alright but the search bar did not work to.

https://docs.microsoft.com/en-us/sharepoint/troubleshoot/search/search-results-not-return