Perhaps you should try some spelling variations:
"multi location research : july 2019" » "multi locations research : july 2019", "multi education research : july 2019", "multi action research : july 2019", "multi option research : july 2019", "multiple locations research : july 2019", "multiplication _ research : july 2019", "multi location research : july 2013", "multi location research : july 2012", "multi location research : july 2015"
"multi vaccine research : july 2006" » "multi medicine research : july 2006", "anti vaccine research : july 2006", "multiple vaccines research : july 2006", "multi vaccine research : july 2008", "multi vaccine research : july 2007", "multi vaccine research : july 2009"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("multi vaccine research : july 2006") or ("multi location research : july 2019"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("multi vaccine research : july 2006") OR ("multi location research : july 2019")).
• Removing quotes may allow a broader search: (( multi vaccine research : july 2006 ) or ( multi location research : july 2019 )).
• Adding a wildcard symbol may retrieve word variants: (("multi vaccine research : july 2006") or ("multi location research : july 2019"))*.