Perhaps you should try some spelling variations:
"online ramsey research document" » "online ramsey research documents", "online ramsey research procurement", "online ramsey research arguments", "online ramsis research document", "online barley research document", "online halley research document", "online reisen research document"
"online ramsey research comment" » "online ramsey research comments", "online ramsey research content", "online ramsey research common", "online ramsis research comment", "online barley research comment", "online halley research comment", "online reisen research comment"
"online based search document" » "line based search document", "spline based search document", "online band search document", "online based research document"
"online rand search or random search document" » "online ranked search or random search document", "online rand research or random search document", "online range search or random search document"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((((("online ramsey research document") OR ("online ramsey research comment"))) OR ("online based search document"))) OR ("online ((rand search) or (random search)) document")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"online ramsey research document\") OR (\"online ramsey research comment\"))) or (\"online based search document\"))) or (\"online ((rand search) or (random search)) document\"))".
• Removing quotes may allow a broader search: (((((( online ramsey research document ) OR ( online ramsey research comment ))) or ( online based search document ))) or ( online ((rand search) or (random search)) document )).
• Adding a wildcard symbol may retrieve word variants: (((((("online ramsey research document") OR ("online ramsey research comment"))) or ("online based search document"))) or ("online ((rand search) or (random search)) document"))*.