split up vs work together

split up

adj
  • Divided or separated. 

verb
  • separate, disassociate, cause to come apart. 

  • Cease to be together, break apart from the group. 

work together

verb
  • To cooperate on a project. 

  • To function together as parts of a larger process. 

  • To be coworkers with someone; to share a workspace with someone. 

How often have the words split up and work together occurred in a corpus of books? (source: Google Ngram Viewer )