Perhaps you should try some spelling variations:
"multi channel research : july 2007" » "multi change research : july 2007", "multi changes research : july 2007", "multi changed research : july 2007", "multi channel research : july 2008", "multi channel research : july 2013", "multi channel research : july 2012"
"multiple actors research : july 2007" » "multiple access research : july 2007", "multiple accounts research : july 2007", "multiple factors research : july 2007", "multiple actions research : july 2007", "multiple author's research : july 2007", "multiple actors research : july 2008", "multiple actors research : july 2013", "multiple actors research : july 2012"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("multi channel research : july 2007") or ("multiple actors research : july 2007"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("multi channel research : july 2007") OR ("multiple actors research : july 2007")).
• Removing quotes may allow a broader search: (( multi channel research : july 2007 ) or ( multiple actors research : july 2007 )).
• Adding a wildcard symbol may retrieve word variants: (("multi channel research : july 2007") or ("multiple actors research : july 2007"))*.