Perhaps you should try some spelling variations:
"economic interventionism" » "economic interventions", "ergonomic interventions", "economic intersections", "economic interactionism", "economic interpretationism", "economic interactionsism"
"economic intervention" » "economic interaction", "economic interpretation", "economic interactions"

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