Perhaps you should try some spelling variations:
"multi option research : july 2009" » "multi opinion research : july 2009", "multi action research : july 2009", "multi optics research : july 2009", "multi location research : july 2009", "multi population research : july 2009", "multi ratios research : july 2009", "multi option research : july 2008", "multi option research : july 2007", "multi option research : july 2019"
"multi option research : july 2012" » "multi opinion research : july 2012", "multi action research : july 2012", "multi optics research : july 2012", "multi location research : july 2012", "multi population research : july 2012", "multi ratios research : july 2012", "multi option research : july 2013"

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"multi option research : july 2009\") OR (\"multi option research : july 2012\"))~".
• Removing quotes may allow a broader search: (( multi option research : july 2009 ) OR ( multi option research : july 2012 ))~.
• Adding a wildcard symbol may retrieve word variants: (("multi option research : july 2009") OR ("multi option research : july 2012"))*.