Perhaps you should try some spelling variations:
"spending operations research : july 2012" » "lending operations research : july 2012", "bonding operations research : july 2012", "spending options research : july 2012", "spending operations research : july 2013"
"scale options research : july 2006" » "scale actions research : july 2006", "scale optics research : july 2006", "scale locations research : july 2006", "share options research : july 2006", "care options research : july 2006", "case options research : july 2006", "scale options research : july 2008", "scale options research : july 2007", "scale options research : july 2009"

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("spending operations research : july 2012") or ("scale options research : july 2006"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("spending operations research : july 2012") OR ("scale options research : july 2006")).
• Removing quotes may allow a broader search: (( spending operations research : july 2012 ) or ( scale options research : july 2006 )).
• Adding a wildcard symbol may retrieve word variants: (("spending operations research : july 2012") or ("scale options research : july 2006"))*.