Hi @Leonid Roubbakh,
There are several reasons will cause the issue. For users not having been assigned site collection permissions with the "Edit" permission level (either direclty to the site or via the 'Members of' group plus the Office 365 group 'Members'), Teams attached modern teamsites cannot be found through global search or have its contents (like list items and files) be retrieved through document library search.
Some setting also relate to crawl latency. You could refer to the following document to update your settings
https://learn.microsoft.com/en-us/sharepoint/troubleshoot/search/search-results-missing
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