Perhaps you should try some spelling variations:
"multi accident research : july 2006" » "multi current research : july 2006", "multi recent research : july 2006", "multi vaccine research : july 2006", "multi client research : july 2006", "multi accident research : july 2008", "multi accident research : july 2009", "multi accident research : july 2013"
"multi action research : july 2007" » "multi national research : july 2007", "multi actor research : july 2007", "multi option research : july 2007", "multi location research : july 2007", "multi action research : july 2008", "multi action research : july 2013", "multi action research : july 2012"

Try widening your search to All Fields.

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 2006") or ("multi action research : july 2007"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("multi accident research : july 2006") OR ("multi action research : july 2007")).
• Removing quotes may allow a broader search: (( multi accident research : july 2006 ) or ( multi action research : july 2007 )).
• Adding a wildcard symbol may retrieve word variants: (("multi accident research : july 2006") or ("multi action research : july 2007"))*.