---

$obozn = Get-Content "C:\Temp\obozn.txt" |
    Where-Object { $_.Trim() -ne "" }

$text = Get-Content "C:\Temp\text.txt" -Raw

$found = foreach ($item in $obozn) {
    $item = $item.Trim()

    if ($text.Contains($item)) {
        $item
    }
}

$found | Set-Content "C:\Temp\naydeno.txt" -Encoding UTF8