Perhaps you should try some spelling variations:
"linear mode" » "linear model", "bilinear model", "nonlinear mode"
"linear models" » "linear modells", "bilinear modells", "nonlinear models"
"line model" » "linear model", "murine model", "line modelsl", "online model", "lines modell"
"line mode" » "line models", "online mode", "lines 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: (((("line mode") OR ("linear mode"))) OR ((("line model") OR ("linear models")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"line mode\") OR (\"linear mode\"))) or (((\"line model\") or (\"linear models\"))))".
• Removing quotes may allow a broader search: (((( line mode ) OR ( linear mode ))) or ((( line model ) or ( linear models )))).
• Adding a wildcard symbol may retrieve word variants: (((("line mode") OR ("linear mode"))) or ((("line model") or ("linear models"))))*.