Setting searching scope problem _ google map api

I'm using unfolding library for processing to retrieve some lodging infos from google map. I set the program searching and displaying the data in 20km of the specific spot on the map. But it has a problem. I extended the restrict area widely however the app can't get the results over 20. It loaded the googlemap api JSON by URL. I know that the search scope is limited by the radius value of URL.

url = "https://maps.googleapis.com/maps/api/place/nearbysearch/json?location=37.705160,127.447744&radius=20000&type=lodging&key=MYKEY";

the code is below

//skip the lib loads

UnfoldingMap map;

DebugDisplay debugDisplay;

SimplePointMarker studio527;

String url;

JSONObject json;

JSONArray resultData;

ArrayList infos;

PFont font;

// the coordination of 527 Studio

float loc_lati = 37.705160;

float loc_longi = 127.447744;

void setup() { size(800, 600); background(255); Location artLocation = new Location(37.705160 , 127.447744); // the spot studio527 = new SimplePointMarker(artLocation);

    map = new UnfoldingMap(this, new Google.GoogleMapProvider()); // map style
    MapUtils.createDefaultEventDispatcher(this, map);
    map.zoomAndPanTo(artLocation, 17); // How much closer to the spot
    float maxPanningDistance = 20; // in km
    map.setPanningRestriction(artLocation, maxPanningDistance);
    //map.addMarkers(studio527); // if you want to creat your own mark style.

    //Create debug display
    //debugDisplay = new DebugDisplay(this, map);

    //load JSON
    url = "https://maps.googleapis.com/maps/api/place/nearbysearch/json?location=37.705160,127.447744&radius=2000&type=lodging&key=MYKEY"; // distance unit meter
    json = loadJSONObject(url);
    resultData = json.getJSONArray("results");
    println(" the number of hotel : " + resultData.size());

    infos = new ArrayList<Result>();

    for(int i=0; i<resultData.size(); i++){
      JSONObject result = resultData.getJSONObject(i);

      // name of lodgings
      String hotel = result.getString("name");
      JSONObject geometry = result.getJSONObject("geometry");

      // location of lodgings
      JSONObject location = geometry.getJSONObject("location"); //no coordination
      float lat = location.getFloat("lat");
      float lng = location.getFloat("lng");
      println( " coordination : latitude - " + lat + " , longitude - " + lng );
      Location loc = new Location(lat, lng);
      Result info = new Result(hotel, loc);
      infos.add(info);

      font = createFont("NanumBarunpen",15);
      textFont(font);
      textAlign(LEFT);
    }

}

void draw() { int count = 0; background(255); //map.draw();

for(int i =0; i<infos.size(); i++){

   Result info = infos.get(i);

   String name = info.getHotel();
   Location coordination = info.getLocation();
   ScreenPosition pos = info.getPos();

   strokeWeight(16);
   stroke(67, 211, 227, 100);
   noFill();
   ellipse(pos.x, pos.y, 12, 12);

   fill(0);
   text(name, pos.x, pos.y);
   println(" count : " + count++ );

}
println("done");

ScreenPosition  studioPos = studio527.getScreenPosition(map);
strokeWeight(12);
stroke(200, 0, 0, 200);
strokeCap(SQUARE);
noFill();
float s = 44;
arc(studioPos.x, studioPos.y, s, s, -PI * 0.9, -PI * 0.1);
arc(studioPos.x, studioPos.y, s, s, PI * 0.1, PI * 0.9);
fill(0);
text("527Studio", studioPos.x - textWidth("527 Studio") / 2, studioPos.y + 4);

}

class Result{

String hotel;

Location loc;

SimplePointMarker marker;

Result(String _name, Location _loc){ hotel = _name; loc = _loc; } String getHotel(){ return hotel; }

Location getLocation(){ return loc; }

ScreenPosition getPos(){ marker = new SimplePointMarker(loc); map.addMarkers(marker); ScreenPosition pos = marker.getScreenPosition(map); return pos; } }