Perhaps you should try some spelling variations:
model league » model legume, model lecture, model leakage
world model » world models
two world » two worlds
own third » own thing, von third
can third » pain third, can think, von third
13.8 two » 1.8 two, 3.8 two, 2.8 two

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: 13.8 two world model league ((own third) OR (can third)).
• Adding a wildcard symbol may retrieve word variants: 13.8 two world model league ((own third) or (can third))*.