Perhaps you should try some spelling variations:
"online hand research documents" » "online hand search document", "online hand research comments", "online hand research catchments", "online rand research documents", "online land research documents", "online sand research documents", "online handel research documents", "online brand research documents", "online hate research documents"
"online band research documents" » "online band search document", "online band research comments", "online band research catchments", "online brand research documents", "online bank research documents", "online bond research documents", "online bin research documents", "online handel research documents"
"online hand research arguments" » "online hand research catchments", "online hand research elements", "online hand research agent", "online rand research arguments", "online land research arguments", "online sand research arguments", "online handel research arguments", "online brand research arguments", "online hate research arguments"
"online channel research students" » "online channel research studies", "online channel research instruments", "online channel research study", "online change research students", "online chain research students", "online changing research students", "nonlinear channel research students", "online chapter research students"

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