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

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("mdg oriented research : july 2013") OR ("meet vaccine research : july 2007"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"mdg oriented research : july 2013\") OR (\"meet vaccine research : july 2007\"))".
• Removing quotes may allow a broader search: (( mdg oriented research : july 2013 ) OR ( meet vaccine research : july 2007 )).
• Adding a wildcard symbol may retrieve word variants: (("mdg oriented research : july 2013") OR ("meet vaccine research : july 2007"))*.