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