Perhaps you should try some spelling variations:
"anti vaccine research : july 2007" » "anti medicine research : july 2007", "ant vaccine research : july 2007", "active vaccine research : july 2007", "aids vaccine research : july 2007", "anti vaccine research : july 2008", "anti vaccine research : july 2013", "anti vaccine research : july 2012"
"multi climate research : july 2009" » "mali climate research : july 2009", "multi client research : july 2009", "bali climate research : july 2009", "multi climate research : july 2008", "multi climate research : july 2019", "multi climate research : july 2006"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("anti vaccine research : july 2007") or ("multi climate research : july 2009"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("anti vaccine research : july 2007") OR ("multi climate research : july 2009")).
• Removing quotes may allow a broader search: (( anti vaccine research : july 2007 ) or ( multi climate research : july 2009 )).
• Adding a wildcard symbol may retrieve word variants: (("anti vaccine research : july 2007") or ("multi climate research : july 2009"))*.