Perhaps you should try some spelling variations:
location research » locations research, education research, action research
vaccine research » medicine research
multi location » multi option, multiple locations, multiplication _
anti vaccine » ant vaccine, active vaccine, aids vaccine
july 2008 » july 2013, july 2020, july 2015
july 2012 » july 2013

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (( anti vaccine research : july 2008 ) OR ( multi location research : july 2012 ))~.
• Adding a wildcard symbol may retrieve word variants: (( anti vaccine research : july 2008 ) or ( multi location research : july 2012 ))*.