Perhaps you should try some spelling variations:
collaborative border » collaborative leader, collaborative model, collaborative courses
collaborative roles » collaborative process, collaborative problem, collaborative forest
sweetland digital » stand digital
digital rhetoric » digital record, digital theorien, visual rhetoric

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "sweetland digital rhetoric ((collaborative roles) OR (collaborative border))~".
• Adding a wildcard symbol may retrieve word variants: sweetland digital rhetoric ((collaborative roles) OR (collaborative border))*.