Perhaps you should try some spelling variations:
"multi accident research : july 2006" » "multi action research : july 2006", "multi vaccine research : july 2006", "multi accident research : july 2013", "multi accident research : july 2012", "multi accident research : july 2011"
"scale options research : july 2009" » "scale operations research : july 2009", "scale action research : july 2009", "scale opinion research : july 2009", "call options research : july 2009", "share options research : july 2009", "care options research : july 2009", "scale options research : july 2013", "scale options research : july 2012", "scale options research : july 2011"

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 ("scale options research : july 2009"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("multi accident research : july 2006") OR ("scale options research : july 2009")).
• Removing quotes may allow a broader search: (( multi accident research : july 2006 ) or ( scale options research : july 2009 )).
• Adding a wildcard symbol may retrieve word variants: (("multi accident research : july 2006") or ("scale options research : july 2009"))*.