[Koha] Indexing for indic-arabic scripts in koha

Hi everyone, I am using Koha which hosts books in multiple languages other than English, including, Hindi, Punjabi, Bengali, Assamese and Urdu, The Bibliographic records for such books are multilingual (with Non-Roman characters in 880 fields). The system retrieves accurate results for English records, but for non-English books like Hindi, and Punjabi the results are not precise. I read somewhere that there is a specific command for zebra indexes that enables non-indic scripts more accurately retrievable. Could you guys help me out here, please? Thank You Rupinder Singh