Perhaps you should try some spelling variations:
"teaching positions research : july 2012" » "teaching locations research : july 2012", "teaching solutions research : july 2012", "teaching transitions research : july 2012", "teaching positions research : july 2013"
"case options research : july 2006" » "case actions research : july 2006", "case optics research : july 2006", "case operations research : july 2006", "care options research : july 2006", "lease options research : july 2006", "scale options research : july 2006", "case options research : july 2008", "case options research : july 2007", "case 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: (("teaching positions research : july 2012") OR ("case options research : july 2006"))~.
• Removing quotes may allow a broader search: (( teaching positions research : july 2012 ) or ( case options research : july 2006 ))~.
• Adding a wildcard symbol may retrieve word variants: (("teaching positions research : july 2012") or ("case options research : july 2006"))*.