UTF-8 encoding error for Loggin with Google

public static String getToken(String code) throws ClientProtocolException, IOException {         String response = Request.Post(Constants.GOOGLE_LINK_GET_TOKEN)                 .bodyForm(  Form.form().add("client_id", Constants.GOOGLE_CLIENT_ID).add("client_secret", Constants.GOOGLE_CLIENT_SECRET)                            .add("redirect_uri", Constants.GOOGLE_REDIRECT_URI)                           .add("code", code)                           .add("grant_type", Constants.GOOGLE_GRANT_TYPE)                            .build()                         )                 .execute().returnContent().asString(Charset.forName("UTF-8"));         JsonObject jobj = new Gson().fromJson(response, JsonObject.class);        String accessToken = jobj.get("access_token").toString().replaceAll("\"", "");        return accessToken;     }public static Account getUserInfo(final String accessToken) throws ClientProtocolException, IOException {    String link = Constants.GOOGLE_LINK_GET_USER_INFO + accessToken;    // Take Response Google API    String response = Request.Get(link).execute().returnContent().asString(Charset.forName("UTF-8"));    JsonObject jobj = new Gson().fromJson(response, JsonObject.class);    String fullName = jobj.get("name").getAsString();    System.out.println("Full Name: " + fullName);      Account googlePojo = new Gson().fromJson(response, Account.class);     googlePojo.setFullName(fullName);    return googlePojo;}

The out put isFull Name: Ng?c Khánh Hu?nh

I dont know utf-8 is not work. I not sure this charset.foName("Utf-8") is correct or i wrong something in the getUserInfor function