Perhaps you should try some spelling variations:
"online rand research comments" » "online rand research commons", "online rand research contents", "online rand research commentary", "online brand research comments", "online card research comments", "online ad research comments", "online band research comments", "online hand research comments"
"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 ranked search document" » "online ranking search document", "online brand search document", "online ramsey search document", "online random search document"
"online based search document" » "line based search document", "spline based search document", "online band search document", "online based research 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 rand research comments") OR ("online range research comments"))) OR ((("online ranked search document") OR ("online based search document")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"online rand research comments\") OR (\"online range research comments\"))) or (((\"online ranked search document\") or (\"online based search document\"))))".
• Removing quotes may allow a broader search: (((( online rand research comments ) OR ( online range research comments ))) or ((( online ranked search document ) or ( online based search document )))).
• Adding a wildcard symbol may retrieve word variants: (((("online rand research comments") OR ("online range research comments"))) or ((("online ranked search document") or ("online based search document"))))*.