Perhaps you should try some spelling variations:
"online rand research documents" » "online rand search document", "online rand research arguments", "online rand research comments", "online brand research documents", "online card research documents", "online ad research documents", "online band research documents", "online hand research documents"
"online range research documents" » "online range search document", "online range research arguments", "online range research comments", "online change research documents", "online large research documents", "online range search documents", "online ring research documents", "nonlinear range research documents"
"online rand search or random search document" » "online ranked search or random search document", "online range search or random search document", "online trend search or random search document"

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 rand research documents") OR ("online range research documents"))) OR ("online ((rand search) or (random search)) document")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"online rand research documents\") OR (\"online range research documents\"))) or (\"online ((rand search) or (random search)) document\"))".
• Removing quotes may allow a broader search: (((( online rand research documents ) OR ( online range research documents ))) or ( online ((rand search) or (random search)) document )).
• Adding a wildcard symbol may retrieve word variants: (((("online rand research documents") OR ("online range research documents"))) or ("online ((rand search) or (random search)) document"))*.