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First, verify that support for your specific lens exists here: https://helpx.adobe.com/x-productkb/multi/lens-profile-support-lightroom-4.html
Then realize that not all profiles are available for both Raw and JPEG.
If you cannot get the profile you need from within Lightroom, it is possible that someone has created it and made it available via the Adobe Lens Profile Downloader. Adobe - Adobe Lens Profile Downloader : For Windows : Adobe Lens Profile Downloader 1.0.1
If no one has made a profile for your specific lens, you would need to make the profile yourself using the Lens Profile Tool Adobe - Adobe Lens Profile Creator : For Macintosh : Adobe Lens Profile Creator 1.0.4
You have to locate profiles or create profiles for those lenses. There is a utility, Adobe Lens Profile Downloader:
If you don't find one available there, then you can use the lens profile creator: