Perhaps you should try some spelling variations:
"embracing action research : july 2012" » "embracing variation research : july 2012", "membrane action research : july 2012", "embracing national research : july 2012", "embracing action research : july 2013"
"call options research : july 2011" » "call actions research : july 2011", "call optics research : july 2011", "call operations research : july 2011", "call option research : july 2011", "real options research : july 2011", "call options research : july 2013", "call options research : july 2015", "call options research : july 2019"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("embracing action research : july 2012") or ("call options research : july 2011"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("embracing action research : july 2012") OR ("call options research : july 2011")).
• Removing quotes may allow a broader search: (( embracing action research : july 2012 ) or ( call options research : july 2011 )).
• Adding a wildcard symbol may retrieve word variants: (("embracing action research : july 2012") or ("call options research : july 2011"))*.