Perhaps you should try some spelling variations:
"anti vaccine research : july 2008" » "anti medicine research : july 2008", "ant vaccine research : july 2008", "active vaccine research : july 2008", "aids vaccine research : july 2008", "anti vaccine research : july 2013", "anti vaccine research : july 2012", "anti vaccine research : july 2020"
"bali climate research : july 2009" » "mali climate research : july 2009", "daily climate research : july 2009", "early climate research : july 2009", "bali climate research : july 2007", "bali climate research : july 2019", "bali 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: "((\"anti vaccine research : july 2008\") OR (\"bali climate research : july 2009\"))~".
• Removing quotes may allow a broader search: (( anti vaccine research : july 2008 ) OR ( bali climate research : july 2009 ))~.
• Adding a wildcard symbol may retrieve word variants: (("anti vaccine research : july 2008") OR ("bali climate research : july 2009"))*.