Perhaps you should try some spelling variations:
"online car research arguments" » "online car research catchments", "online car research students", "online car research elements", "online care research arguments", "online card research arguments", "online cars research arguments", "online chat research arguments", "online ch research arguments", "online co research arguments"
"online case research comments" » "online case research commons", "online case research contents", "online case research commentary", "online care research comments", "online use research comments", "online change research comments", "online class research comments", "online classes research comments"
"online hand search document" » "online band search document", "online handel search document", "online brand search document", "online hana search document", "online hard search document", "online paid search document"

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 car research arguments") OR ("online case research comments"))) OR ("online hand search document")).
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