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 band research documents", "online brand research documents", "online hate 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 band research arguments", "online brand research arguments", "online hate research arguments"
"online handel research students" » "online handel research studies", "online handel research instruments", "online handel research study", "online channel research students", "online panel research students", "online hanse research students", "online bandel research students", "online brandel research students", "online hateel research students"
"online bandel research students" » "online bandel research studies", "online bandel research instruments", "online bandel research study", "online panel research students", "online channel research students", "online mundell research students", "online handels research students", "online band research students", "online tandem research students"

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