Perhaps you should try some spelling variations:
"online hand research documents" » "online hand research comments", "online hand research catchments", "online hand research students", "online rand research documents", "online sand research documents", "online brand research documents", "online handel research documents", "online hate research documents"
"online land research arguments" » "online land research catchments", "online land research students", "online land research agent", "online gland research arguments", "online lands research arguments", "online rand research arguments", "online brand research arguments", "online loans research arguments", "online plans research arguments"
"online land research elements" » "online land research experiments", "online land research effects", "online land research students", "online gland research elements", "online lands research elements", "online rand research elements", "online brand research elements", "online loans research elements", "online plans research elements"
"online band search document" » "online brand search document", "online bin search document", "online handel search document", "online based search document", "online bound search document", "online blind search document"

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