Perhaps you should try some spelling variations:
"4.1 oriented research : july 2007" » "4.1 related research : july 2007", "4.1 extended research : july 2007", "sex oriented research : july 2007", "_ oriented research : july 2007", "bim oriented research : july 2007", "4.1 oriented research : july 2008", "4.1 oriented research : july 2013", "4.1 oriented research : july 2020"
"meet vaccine research : july 2012" » "meet medicine research : july 2012", "media vaccine research : july 2012", "ant vaccine research : july 2012", "mr vaccine research : july 2012", "meet vaccine research : july 2013"

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: (("4.1 oriented research : july 2007") or ("meet vaccine research : july 2012"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("4.1 oriented research : july 2007") OR ("meet vaccine research : july 2012")).
• Removing quotes may allow a broader search: (( 4.1 oriented research : july 2007 ) or ( meet vaccine research : july 2012 )).
• Adding a wildcard symbol may retrieve word variants: (("4.1 oriented research : july 2007") or ("meet vaccine research : july 2012"))*.