can't find some fields added in a content type

I added some additional fields in a content type, but when I tried to add them in views by admin/structure/views/nojs/add-item/test/default/field, I found out that they are not there, so I can't have a view to display those fields and results. I also noticed that those fields are under some field collections I created using the module Field Collection http://drupal.org/project/field_collection, and other fields that are not created under the collections can be found and added in views.