Perhaps you should try some spelling variations:
representation clear » representation great, representation theory, representation scheme
based representation » based presentation, self representation, data representation
clear studies » career studies, leaver studies, queer studies
across older » across borders, across gender, across one
across modes » across borders

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 ((across older) OR (across modes)) based representation clear studies.~.
• Adding a wildcard symbol may retrieve word variants: commercial ((across older) or (across modes)) based representation clear studies.*.