Perhaps you should try some spelling variations:
based representation » based presentation, self representation, data representation
representation clear » representation great, representation theory, representation scheme
commercial crops » commercial code, commercial credit, commercial banks
crops fourier » group fourier
fourier based » course based, order based
clear studies » career studies, leaver studies, queer studies

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

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