How to filter Keyword not defined in Api?

Hello, how to filter keyword not defined in api?

I use segmentation and test:

&segment=referrerKeyword!@Keyword
&segment=referrerKeyword!@not
&segment=referrerKeyword!@defined

but all not work…Info?

Thanks

You could use referrer type != search ?

Good news: you can now use our new Search Engine Keywords Performance plugin which lets you import your Google, Bing and Yahoo keywords into your Piwik. Learn more about the reports provided and how to import keywords on the plugin page and in the Search Keywords Monitor User Guide.