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