Conditional fields module, "OR"-like operator
Maybe, the Views If Empty module could be of use to you. Here is a quote about it (from the module's project page):


  ...  enables a view to output a field if another field is empty.
  
  You need Views If Empty when you have a content type with an embedded video and an imagefield thumbnail. The nodes always have the images but occasionally have a video. You want your view to display the image field when the video field is empty, display the video field when available, and never display both.