Perhaps you should try some spelling variations:
"social jnet model" » "social net model", "social je model", "social magnet model", "social jet model", "social unet model", "social jnnet model", "social jnset model", "social jnjet model"
"social nets model" » "social news model", "social net model", "social needs model"
"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 ((("social jnet model") OR ("social nets model")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"social et model\") or (((\"social jnet model\") OR (\"social nets model\"))))".
• Removing quotes may allow a broader search: (( social et model ) or ((( social jnet model ) OR ( social nets model )))).
• Adding a wildcard symbol may retrieve word variants: (("social et model") or ((("social jnet model") OR ("social nets model"))))*.