Perhaps you should try some spelling variations:
based representation » based presentation, self representation, data representation
commercial across » commercial crops, commercial actors, commercial crisis
leaver studies » slavery studies, teacher studies, gender studies
clear studies » career studies, queer studies, war studies
across order » across older, across borders, across gender
order based » fourier based, gender based

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

• Performing a fuzzy search may retrieve terms with similar spellings: commercial across order based representation ((clear studies) OR (leaver studies)).~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "commercial across order based representation ((clear studies) OR (leaver studies)).".
• Adding a wildcard symbol may retrieve word variants: commercial across order based representation ((clear studies) OR (leaver studies)).*.