Perhaps you should try some spelling variations:
"multi accident research : july 2019" » "multi current research : july 2019", "multi recent research : july 2019", "multi vaccine research : july 2019", "multi client research : july 2019", "multi accident research : july 2013", "multi accident research : july 2012", "multi accident research : july 2015"
"acid climate research : july 2009" » "arid climate research : july 2009", "amid climate research : july 2009", "rapid climate research : july 2009", "acid climate research : july 2008", "acid climate research : july 2007", "acid climate research : july 2006"

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: "((\"multi accident research : july 2019\") OR (\"acid climate research : july 2009\"))~".
• Removing quotes may allow a broader search: (( multi accident research : july 2019 ) OR ( acid climate research : july 2009 ))~.
• Adding a wildcard symbol may retrieve word variants: (("multi accident research : july 2019") OR ("acid climate research : july 2009"))*.