Perhaps you should try some spelling variations:
"linear mode" » "linear model", "linear models", "bilinear model"
"online mode" » "online model", "online medien", "online media", "onlines model", "onone mode"
"line models" » "line model", "linear models", "murine models", "line modells", "lines modells", "one models"
"line mode" » "line model", "lines model", "one mode"

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: (((((("line mode") OR ("online mode"))) OR ("linear mode"))) OR ("line models")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"line mode\") OR (\"online mode\"))) or (\"linear mode\"))) or (\"line models\"))".
• Removing quotes may allow a broader search: (((((( line mode ) OR ( online mode ))) or ( linear mode ))) or ( line models )).
• Adding a wildcard symbol may retrieve word variants: (((((("line mode") OR ("online mode"))) or ("linear mode"))) or ("line models"))*.