When you deploy your Meteor app (including with meteor deploy), just having xx = new Meteor.Collection("xx"); won't create any collections.
You have to insert data on your server to create the collections
If you mean to meteor.com hosting you can use meteor mongo xxx.meteor.com, if it is your own database you would have to connect to it manually with a tool like robomongo or the mongo shell (mongo <host>:<port>/<dbname> -u <username> -p <password>
If the data exists there but it is not visible with your app via the web browser, try adding back the autopublish package and if this works you may need to make a custom publish rule for your data