Perhaps you should try some spelling variations:
representation germany » representation learning, representation series
based representation » based presentation, self representation, data representation
germany studies » german studies, germany studied, germany series
code earth » code search, one earth
done part » one part, come part

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: commercial ((code earth) OR (done part)) based representation germany studies.~.
• Adding a wildcard symbol may retrieve word variants: commercial ((code earth) or (done part)) based representation germany studies.*.