Perhaps you should try some spelling variations:
"economic interventionism" » "economic interventions", "ergonomic interventions", "economic intersections", "economic interactionism", "economic interpretationism", "economic integrationism"
"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 interventionism") OR ("economic interactionism"))) OR ("economic intervention")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"economic interventionism\") OR (\"economic interactionism\"))) or (\"economic intervention\"))".
• Removing quotes may allow a broader search: (((( economic interventionism ) OR ( economic interactionism ))) or ( economic intervention )).
• Adding a wildcard symbol may retrieve word variants: (((("economic interventionism") OR ("economic interactionism"))) or ("economic intervention"))*.