glance over vs play at

glance over

verb
  • to quickly inspect something (newspaper, notes) with the eyes 

play at

verb
  • To do something in a manner that lacks seriousness, commitment, or professionalism. 

  • To pretend to be a different person while playing a game. 

How often have the words glance over and play at occurred in a corpus of books? (source: Google Ngram Viewer )