Perhaps you should try some spelling variations:
"economic interactionism" » "economic interactions", "economic interaction", "economic intersections"
"economic intervention" » "economic interaction", "economic interpretation", "economic integration"

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: (("economic interactionism") OR ("economic intervention")).
• Removing quotes may allow a broader search: (( economic interactionism ) or ( economic intervention )).
• Adding a wildcard symbol may retrieve word variants: (("economic interactionism") or ("economic intervention"))*.