In order to efficiently learn multiple foreign languages simultaneously, I noticed that resources provided in multiple languages can act as a big help.
I have been using http://www.goethe-verlag.com/book2/ for some time, but now I would appreciate something more difficult in order to learn more vocabulary.
I guess that administrators of this site would like to avoid any "contest of learning resources" (because my question can be perceived as too broad). For that reason I am asking for a technique of searching rather than raw links.
To make my question less broad I would like to add: How to find resources closer to my scope of interests? For instance it is: popular science, programming and technology.
I would also like to focus mainly on listening resources but if none found I would appreciate reading resources too.