Perhaps you should try some spelling variations:
"ergonomic interventions" » "economic intervention", "robotic interventions", "endoscopic interventions"
"economic interventions" » "economic intervention", "economic intersections", "economy interventions"
"economic interactions" » "economic integration", "dynamic interactions", "economics international", "economic integrations", "economic informations"
"economic interaction" » "economic integration", "dynamic interaction", "economic information"

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: (((("ergonomic interventions") OR ("economic interventions"))) OR ((("economic interactions") OR ("economic interaction")))).
• Removing quotes may allow a broader search: (((( ergonomic interventions ) or ( economic interventions ))) or ((( economic interactions ) or ( economic interaction )))).
• Adding a wildcard symbol may retrieve word variants: (((("ergonomic interventions") or ("economic interventions"))) or ((("economic interactions") or ("economic interaction"))))*.