Perhaps you should try some spelling variations:
"social beasts model" » "social bases model", "social basis model", "social biases model", "social beats model", "social tests model", "social beasts made"
"social rate model" » "social role model", "social re model", "social rank model", "social rate models", "social state model", "social primate model"

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 beasts model") OR ("social rate model"))*.
• Removing quotes may allow a broader search: (( social beasts model ) or ( social rate model ))*.