I see, when setting up the news in your case, you can just specify that the alert is for RVVT symbol. Then, don't put anything in the filter for the SOURCE. You don't care about that. If you want to only be alerted for news that have particular keywords in the headline, then put that into the HEADLINE filter. Otherwise, if you want to be alerted for every news headline on RVVT, leave the headline filter blank as well.
NOTE: you will want to also set it so the alert is automatically cleared after X seconds. Otherwise, if the alert triggers and not cleared, it will not trigger again if another headline comes in