Perhaps you should try some spelling variations:
"multi accident research : july 2007" » "multi current research : july 2007", "multi recent research : july 2007", "multi vaccine research : july 2007", "multi client research : july 2007", "multi accident research : july 2008", "multi accident research : july 2013", "multi accident research : july 2012"
"multiple options research : july 2009" » "multiple locations research : july 2009", "multiple positions research : july 2009", "multiple solutions research : july 2009", "multiple actions research : july 2009", "multiple optics research : july 2009", "multiple operations research : july 2009", "multiple options research : july 2008", "multiple options research : july 2019", "multiple options research : july 2006"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("multi accident research : july 2007") or ("multiple options research : july 2009"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("multi accident research : july 2007") OR ("multiple options research : july 2009")).
• Removing quotes may allow a broader search: (( multi accident research : july 2007 ) or ( multiple options research : july 2009 )).
• Adding a wildcard symbol may retrieve word variants: (("multi accident research : july 2007") or ("multiple options research : july 2009"))*.