[Koha] Searching UTF-8 entries [Koha 3.01.00.002]

Dear All, I recently imported our stock of 70'000 records into Koha via the Koha interface. Now I am kind of wondering, whether I am for some reason unable to search for Chinese (UTF-8 coded) entries, which seemed to work fine when there were only two of them around, or whether Zebra is still on its way indexing the new stuff. Is there a way of telling, whether Zebra is still indexing? (It took like two days until we could search for the western entries from A-Z.) Appreciating any hints. Best regards, Marc