Perhaps you should try some spelling variations:
"linear model" » "linear models", "linear modelsl", "bilinear modell", "nonlinear model"
"online mode" » "online model", "online medien", "online media"
"linear mode" » "linear models", "bilinear model", "nonlinear mode"
"line model" » "linear models", "murine 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: (((("online mode") OR ("linear mode"))) OR ((("linear model") OR ("line model")))).
• Removing quotes may allow a broader search: (((( online mode ) or ( linear mode ))) or ((( linear model ) or ( line model )))).
• Adding a wildcard symbol may retrieve word variants: (((("online mode") or ("linear mode"))) or ((("linear model") or ("line model"))))*.