Perhaps you should try some spelling variations:
"meet vaccine research : july 2019" » "meet medicine research : july 2019", "media vaccine research : july 2019", "ant vaccine research : july 2019", "mr vaccine research : july 2019", "meet vaccine research : july 2013", "meet vaccine research : july 2012", "meet vaccine research : july 2015"
"threat climate research : july 2009" » "heat climate research : july 2009", "direct climate research : july 2009", "forest climate research : july 2009", "threat climate research : july 2008", "threat climate research : july 2007", "threat 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: (("meet vaccine research : july 2019") or ("threat climate research : july 2009"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("meet vaccine research : july 2019") OR ("threat climate research : july 2009")).
• Removing quotes may allow a broader search: (( meet vaccine research : july 2019 ) or ( threat climate research : july 2009 )).
• Adding a wildcard symbol may retrieve word variants: (("meet vaccine research : july 2019") or ("threat climate research : july 2009"))*.