Perhaps you should try some spelling variations:
"lines modell" » "lines model", "eines modell", "lines models"
"linear mode" » "linear model", "bilinear model", "nonlinear mode"
"linear models" » "linear modells", "bilinear modells", "nonlinear models"
"line mode" » "line model", "line models", "online mode"

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: (((("line mode") OR ("linear mode"))) OR ((("lines modell") OR ("linear models")))).
• Removing quotes may allow a broader search: (((( line mode ) or ( linear mode ))) or ((( lines modell ) or ( linear models )))).
• Adding a wildcard symbol may retrieve word variants: (((("line mode") or ("linear mode"))) or ((("lines modell") or ("linear models"))))*.