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