Instead of using campaign level targeting, you could use experience level targeting , and instead of using both of the conditions I mentioned in my post earlier , you could think of using referrers as being sample.com, or sample1.com as per your requirements.
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This is definitely possible with our tool. You could accomplish this by setting the campaign level Targeting to do this for you.
First you would have to select Site Pages in targeting section and you can set up the "previous page URL" to match "www.sample.com" in your example, and in the next step, you could go to the "Traffic Sources" tab and set the landing page to your Homepage.
This would make sure that this campaign is targeted only to the visitors who came from the specific URL mentioned by you, and who also landed on the homepage.
Please let us know if there is any additional information that is needed, and we will work on it ASAP.