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