Perhaps you should try some spelling variations:
based representation » based presentation, self representation, data representation
representation based » representations based, presentation based, representation basic
commercial actors » commercial crops, commercial sector, commercial farmers
actors models » factor models, vector models, action models
based studies » case studies
models based » model based, models case

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

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