Perhaps you should try some spelling variations:
representation earlier » representation learning, representation series, representation values
based representation » based presentation, self representation, data representation
earlier studies » early studies
north based » earth based, north case
code north » modern north

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

• Performing a fuzzy search may retrieve terms with similar spellings: commercial code north based representation earlier studies.~.
• Adding a wildcard symbol may retrieve word variants: commercial code north based representation earlier studies.*.