Perhaps you should try some spelling variations:
representations based » presentation based, representation basic, representational basis
commercial crisis » commercial crimes, commercial risks, commercial credits
based studies » case studies
modes shared » model shared, des shared, does shared
mode share » modal share, modal shares, golden share

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

• Performing a fuzzy search may retrieve terms with similar spellings: commercial crisis ((modes shared) OR (mode share)) representations based studies.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "commercial crisis ((modes shared) OR (mode share)) representations based studies.".
• Adding a wildcard symbol may retrieve word variants: commercial crisis ((modes shared) OR (mode share)) representations based studies.*.