Perhaps you should try some spelling variations:
"multi accident research : july 2009" » "multi action research : july 2009", "multi vaccine research : july 2009", "multi accident research : july 2013", "multi accident research : july 2012", "multi accident research : july 2011"
"multi factor research : july 2006" » "multi sector research : july 2006", "multi action research : july 2006", "multi water research : july 2006", "_ multifactor research : july 2006", "multi faceted research : july 2006", "multi factor research : july 2013", "multi factor research : july 2012", "multi factor research : july 2011"

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: (("multi accident research : july 2009") OR ("multi factor research : july 2006"))~.
• Removing quotes may allow a broader search: (( multi accident research : july 2009 ) or ( multi factor research : july 2006 ))~.
• Adding a wildcard symbol may retrieve word variants: (("multi accident research : july 2009") or ("multi factor research : july 2006"))*.