Perhaps you should try some spelling variations:
mixed initiative » road initiative
initiative app » initiative a, initiative ai, initiative als
mixed initial » mixed martial
initial tract » initial traces, initial crack, initial trust

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 initiative app ) OR ( mixed initial tract )).
• Adding a wildcard symbol may retrieve word variants: (( mixed initiative app ) or ( mixed initial tract ))*.