Perhaps you should try some spelling variations:
"online channel research documents" » "online channel research arguments", "online channel research comments", "online channel research catchments", "online change research documents", "online chain research documents", "online changing research documents", "nonlinear channel research documents", "online chapter research documents"
"online hand research students" » "online hand research studies", "online hand research instruments", "online hand research studying", "online rand research students", "online land research students", "online sand research students", "online band research students", "online handel research students", "online brand research students"
"online hand research study" » "online rand research study", "online land research study", "online sand research study", "online band research study", "online handel research study", "online brand research study"
"online hana search document" » "online halal search document", "online kanal search document", "online hate search document", "online data search document", "online java search document", "online dna search document"

Try widening your search to All Fields.

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