public function postTaoTaiKhoanNhanVienTruong(TaiKhoanNhanVienTruongRequest $request)
 {
     // thêm vào bảng users
     $user = new User();
     $user->username = $request->txtUsername;
     $user->name = $request->txtName;
     $user->password = Hash::make($request->txtPassword);
     $user->save();
     // thêm vào bảng permission_user
     $permission = Permission::where('slug', 'universitystaff')->get()->first();
     $permissionUser = new PermissionUser();
     $permissionUser->permission_id = $permission->id;
     $permissionUser->user_id = $user->id;
     $permissionUser->save();
     // thêm trường
     $truong = new Truong();
     $truong->tentr = $request->txtUniversity;
     $truong->matr = $request->txtUniversityCode;
     $truong->nhanvienquanly_user_id = $user->id;
     $truong->save();
     return redirect()->action('ClusterStaffManagerController@getTaoTaiKhoanNhanVienTruong')->with(['flash_level' => 'success', 'flash_message' => 'Thêm tài khoản thành công!']);
 }