Perhaps you should try some spelling variations:
representations based » presentation based, representation basic, representational basis
commercial crimes » commercial crops, commercial farmers, commercial code
based studies » case studies
modes shared » model shared, mode share, des shared
modal shares » modal 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 crimes ((modes shared) or (modal shares)) representations based studies.~.
• If you are trying to use Boolean operators, they must be ALL CAPS: commercial crimes ((modes shared) OR (modal shares)) representations based studies..
• Adding a wildcard symbol may retrieve word variants: commercial crimes ((modes shared) or (modal shares)) representations based studies.*.