Perhaps you should try some spelling variations:
"scale options research : july 2013" » "scale actions research : july 2013", "scale optics research : july 2013", "scale operations research : july 2013", "share options research : july 2013", "care options research : july 2013", "case options research : july 2013"
"call options research : july 2006" » "call actions research : july 2006", "call optics research : july 2006", "call operations research : july 2006", "call option research : july 2006", "real options research : july 2006", "call options research : july 2008", "call options research : july 2007", "call options research : july 2009"

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (("scale options research : july 2013") OR ("call options research : july 2006"))~.
• Removing quotes may allow a broader search: (( scale options research : july 2013 ) or ( call options research : july 2006 ))~.
• Adding a wildcard symbol may retrieve word variants: (("scale options research : july 2013") or ("call options research : july 2006"))*.