This is Luke from Korean Partner, Goldpitcher.
We got strong conplaint from our one of customers on searching with Korean.

1. Search with 3 Korean word.
2. There's no result even if site has one matching search word.

Search result with 2 Korean word is OK. but 3 word is not.
It seems to be the same with 2 byte another language.

I think this is so related to Lucene that it's hard to fix or advance it.
But I would like you to get interest with this issue and monitor and inform it of my customer.

Please check and let me know any information when it's updated and schedule if any.

Thanks in advance.

NB This also applies to Kanji characters