Perhaps you should try some spelling variations:
"mr vaccine research : july 2007" » "mr medicine research : july 2007", "mr vaccines research : july 2007", "_ vaccine research : july 2007", "19 vaccine research : july 2007", "mr vaccine research : july 2013", "mr vaccine research : july 2012", "mr vaccine research : july 2020"
"mindset science research : july 2008" » "mindset resilience research : july 2008", "feminist science research : july 2008", "mindset oriented research : july 2008", "mindset science research : july 2013", "mindset science research : july 2012", "mindset science research : july 2020"

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("mindset science research : july 2008") or ("mr vaccine research : july 2007"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("mindset science research : july 2008") OR ("mr vaccine research : july 2007")).
• Removing quotes may allow a broader search: (( mindset science research : july 2008 ) or ( mr vaccine research : july 2007 )).
• Adding a wildcard symbol may retrieve word variants: (("mindset science research : july 2008") or ("mr vaccine research : july 2007"))*.