Perhaps you should try some spelling variations:
branchen processes » branching processes, branch processes, branchen prozesse
brain processes » chain processes, branching processes
pain processing » domain processing, protein processing, vision processing

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((((brain processes) OR (pain processing))) OR (branchen processes)).
• Adding a wildcard symbol may retrieve word variants: ((((brain processes) or (pain processing))) or (branchen processes))*.