Classifier.isCrawler misses on many bots

I tried out some Crawler UserAgent as described here:
https://www.keycdn.com/blog/web-crawlers/

Most of them failed to classify as Crawler, examples:

Mozilla/5.0 (compatible; Bingbot/2.0; +http://www.bing.com/bingbot.htm)
DuckDuckBot/1.0; (+http://duckduckgo.com/duckduckbot.html)
Mozilla/5.0 (compatible; YandexBot/3.0; +http://yandex.com/bots)
Sogou Pic Spider/3.0( http://www.sogou.com/docs/help/webmasters.htm#07)
Sogou head spider/3.0( http://www.sogou.com/docs/help/webmasters.htm#07)
Sogou web spider/4.0(+http://www.sogou.com/docs/help/webmasters.htm#07)
Sogou Orion spider/3.0( http://www.sogou.com/docs/help/webmasters.htm#07)
Sogou-Test-Spider/4.0 (compatible; MSIE 5.5; Windows 98)
Mozilla/5.0 (compatible; Konqueror/3.5; Linux) KHTML/3.5.5 (like Gecko) (Exabot-Thumbnails)
ia_archiver (+http://www.alexa.com/site/help/webmasters; crawler@alexa.com)

[tagomoris]

https://github.com/woothee/woothee-java#finding-crawlers-almost-all-not-all-in-fast