Perhaps you should try some spelling variations:
"online range research comments" » "online range research commons", "online range research contents", "online range research commentary", "online change research comments", "online large research comments", "online range search comments", "online ring research comments", "nonlinear range research comments"
"online handel research concepts" » "online handel research context", "online channel research concepts", "online panel research concepts", "online hanse research concepts"

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (("online range research comments") OR ("online handel research concepts")).
• Removing quotes may allow a broader search: (( online range research comments ) or ( online handel research concepts )).
• Adding a wildcard symbol may retrieve word variants: (("online range research comments") or ("online handel research concepts"))*.