plough into vs topple

plough into

verb
  • To crash into something. 

  • To engage in some activity with vigor. 

  • To invest a resource (money, material, energy) into something. 

topple

verb
  • To totter and fall, or to lean as if about to do so. 

  • To overturn 

  • To overthrow something. 

  • To push or throw over 

How often have the words plough into and topple occurred in a corpus of books? (source: Google Ngram Viewer )