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