Perhaps you should try some spelling variations:
"social jetlag model" » "social eulag model", "social lag model", "social jet model"
"social jnet model" » "social net model", "social nets model", "social je model", "social jet model", "social unet model"
"social e model" » "social en model", "social e modelli"

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 e model") OR ((("social jetlag model") OR ("social jnet model")))).
• Removing quotes may allow a broader search: (( social e model ) or ((( social jetlag model ) or ( social jnet model )))).
• Adding a wildcard symbol may retrieve word variants: (("social e model") or ((("social jetlag model") or ("social jnet model"))))*.