Perhaps you should try some spelling variations:
"multi national research : july 2008" » "multi educational research : july 2008", "multinationals _ research : july 2008", "multi national research : july 2013", "multi national research : july 2012", "multi national research : july 2020"
"multi option research : july 2006" » "multi opinion research : july 2006", "multi action research : july 2006", "multi optics research : july 2006", "multi location research : july 2006", "multi population research : july 2006", "multi ratios research : july 2006", "multi option research : july 2007", "multi option research : july 2009", "multi option research : july 2013"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("multi option research : july 2006") or ("multi national research : july 2008"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("multi option research : july 2006") OR ("multi national research : july 2008")).
• Removing quotes may allow a broader search: (( multi option research : july 2006 ) or ( multi national research : july 2008 )).
• Adding a wildcard symbol may retrieve word variants: (("multi option research : july 2006") or ("multi national research : july 2008"))*.