Perhaps you should try some spelling variations:
"anti vaccine research : july 2006" » "anti medicine research : july 2006", "ant vaccine research : july 2006", "active vaccine research : july 2006", "aids vaccine research : july 2006", "anti vaccine research : july 2008", "anti vaccine research : july 2007", "anti vaccine research : july 2013"
"multi water research : july 2009" » "multi water resource : july 2009", "multi further research : july 2009", "multi rater research : july 2009", "multi layer research : july 2009", "multi rate research : july 2009", "multi water research : july 2008", "multi water research : july 2007", "multi water research : july 2019"

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