Perhaps you should try some spelling variations:
"i options research : july 2006" » "i actions research : july 2006", "i optics research : july 2006", "i operations research : july 2006", "4 options research : july 2006", "2 options research : july 2006", "iii options research : july 2006", "i options research : july 2008", "i options research : july 2007", "i options research : july 2009"
"multi factor research : july 2011" » "multi factors research : july 2011", "multi sector research : july 2011", "multi actors research : july 2011", "multi actor research : july 2011", "_ multifactor research : july 2011", "multi factor research : july 2013", "multi factor research : july 2012", "multi factor research : july 2015"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("i options research : july 2006") or ("multi factor research : july 2011"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("i options research : july 2006") OR ("multi factor research : july 2011")).
• Removing quotes may allow a broader search: (( i options research : july 2006 ) or ( multi factor research : july 2011 )).
• Adding a wildcard symbol may retrieve word variants: (("i options research : july 2006") or ("multi factor research : july 2011"))*.