Perhaps you should try some spelling variations:
based representation » based presentation, self representation, data representation
commercial across » commercial crops, commercial actors, commercial crisis
across fourier » across sources, across countries
fourier based » course based, order based
legal studies » global studies, regional studies
local studies » social studies, global studies, local bodies

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 fourier based representation ((legal studies) or (local studies)).~.
• If you are trying to use Boolean operators, they must be ALL CAPS: commercial across fourier based representation ((legal studies) OR (local studies))..
• Adding a wildcard symbol may retrieve word variants: commercial across fourier based representation ((legal studies) or (local studies)).*.