Perhaps you should try some spelling variations:
"mixed criticality resource" » "mixed critical resource", "mixed critical resources", "mixed criticality results"
"mixed initiative app" » "road initiative app", "mixed initiative a", "mixed initiative ai", "mixed initiative als"

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: (("mixed criticality resource") OR ("mixed initiative app")).
• Removing quotes may allow a broader search: (( mixed criticality resource ) or ( mixed initiative app )).
• Adding a wildcard symbol may retrieve word variants: (("mixed criticality resource") or ("mixed initiative app"))*.