Perhaps you should try some spelling variations:
"meet accident research : july 2006" » "meet action research : july 2006", "meet client research : july 2006", "meet accident research : july 2013", "meet accident research : july 2012", "meet accident research : july 2011"
"anti vaccine research : july 2009" » "anti action research : july 2009", "aids vaccine research : july 2009", "new vaccine research : july 2009", "anti vaccine research : july 2013", "anti vaccine research : july 2012", "anti vaccine research : july 2011"

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"anti vaccine research : july 2009\") OR (\"meet accident research : july 2006\"))~".
• Removing quotes may allow a broader search: (( anti vaccine research : july 2009 ) OR ( meet accident research : july 2006 ))~.
• Adding a wildcard symbol may retrieve word variants: (("anti vaccine research : july 2009") OR ("meet accident research : july 2006"))*.