Perhaps you should try some spelling variations:
"societal effect model" » "societal effects model", "social effects model", "society effects model", "societal effects models", "societal effective model"
"societal effect models" » "societal effects models", "social effects models", "society effects models", "societal effects modelss", "societal effective models"
"social et model" » "social en model", "social e model", "social etats model", "social net model", "social set model", "social jet model"

Try widening your search to All Fields.

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: (("social et model") OR ((("societal effect model") OR ("societal effect models")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"social et model\") or (((\"societal effect model\") OR (\"societal effect models\"))))".
• Removing quotes may allow a broader search: (( social et model ) or ((( societal effect model ) OR ( societal effect models )))).
• Adding a wildcard symbol may retrieve word variants: (("social et model") or ((("societal effect model") OR ("societal effect models"))))*.