I am not understanding some fundamental js ideas here, what am i missing?

moving data around

function findBeer(words) {
  
  var search_terms = [];
  var rows = [];
  
  //
  // I want to assign a variable from the 'getResults' callback
  // to this:
  //
  
  results = getResults(word); // This is always undefined
  
  console.log(getResults());
  
} 

function getResults(word) {
  
  var db = 'http://localhost:5984/beer_list/_design/beer_key/_view/_full_name?include_docs=true';
  var results = [];
  var response = [];
  var j = 0;
  var reg_exp = new RegExp("" + word + "", 'i');
  
  request({uri:db}, function (err, resp, b) {

    if (err) throw err;
    if (resp.statusCode !== 200) throw new Error("Could not get document. " + b );
    response = JSON.parse(b);
    
    return "this was a test"; // This should get assined to results above
    
    for (var i = 0; i < response.rows.length; i += 1) {

      if (response.rows[i].key.search(reg_exp) !== -1) {
        results[j] = response.rows[i];
        j += 1;
      } 
    }
  });
  
}