Perhaps you should try some spelling variations:
"_ multinationals report : july 2009" » "_ multinationals pt : july 2009", "_ multinationales aspect : july 2009", "_ multinational motor : july 2009", "_ multinationals report : july 2008", "_ multinationals report : july 2007", "_ multinationals report : july 2006"
"multi vaccine research : july 2019" » "multi medicine research : july 2019", "anti vaccine research : july 2019", "multiple vaccines research : july 2019", "multi vaccine research : july 2013", "multi vaccine research : july 2012", "multi vaccine research : july 2015"

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: (("_ multinationals report : july 2009") or ("multi vaccine research : july 2019"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("_ multinationals report : july 2009") OR ("multi vaccine research : july 2019")).
• Removing quotes may allow a broader search: (( _ multinationals report : july 2009 ) or ( multi vaccine research : july 2019 )).
• Adding a wildcard symbol may retrieve word variants: (("_ multinationals report : july 2009") or ("multi vaccine research : july 2019"))*.