Perhaps you should try some spelling variations:
"online rand research arguments" » "online rand research catchments", "online rand research students", "online rand research elements", "online brand research arguments", "online range research arguments", "online ad research arguments", "online band research arguments", "online hand research arguments"
"online card research arguments" » "online card research catchments", "online card research students", "online card research elements", "online care research arguments", "online based research arguments", "online car research arguments", "online case research arguments"
"online handel research documents" » "online handel search document", "online handel research comments", "online handel research catchments", "online panel research documents", "online hanse research documents", "online handover research documents"
"online channel research documents" » "online channel search document", "online channel research comments", "online channel research catchments", "online change research documents", "online chain research documents", "online changing research documents", "nonlinear channel research documents", "online chapter research documents"

Try widening your search to All Fields.

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