Speech corpora for VAD
Look into the MUSAN corpus from the Kaldi people (Dan Povey, et al): 


Corpus audio/text  
Check the arxiv paper



  MUSAN is a new corpus of music, speech, and noise. This dataset is
  suitable for training models for voice activity detection (VAD) and
  music/speech discrimination. Our corpus is released under a flexible
  Creative Commons license. The dataset consists of music from several
  genres, speech from twelve languages, and a wide assortment of
  technical and non-technical noises. We demonstrate use of this corpus
  for music/speech discrimination on Broadcast news and VAD for speaker
  identification.