Perhaps you should try some spelling variations:
"multi central research : july 2007" » "multi general research : july 2007", "multi control research : july 2007", "multi centre research : july 2007", "multi centrality research : july 2007", "multi sectoral research : july 2007", "multi cultural research : july 2007", "multi central research : july 2008", "multi central research : july 2013", "multi central research : july 2020"
"multi group research : july 2012" » "multi groups research : july 2012", "multi crop research : july 2012", "multi growth research : july 2012", "multiple group research : july 2012", "multi group 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: (("multi group research : july 2012") or ("multi central research : july 2007"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("multi group research : july 2012") OR ("multi central research : july 2007")).
• Removing quotes may allow a broader search: (( multi group research : july 2012 ) or ( multi central research : july 2007 )).
• Adding a wildcard symbol may retrieve word variants: (("multi group research : july 2012") or ("multi central research : july 2007"))*.