Search query problem with russian symbols

[Zokirjon-Ashiraliyev]

@query(
'''SELECT client.*, GROUP_CONCAT(client_visit_date.day) AS visit_dates
FROM client
LEFT JOIN client_visit_date ON client.client_id = client_visit_date.client_id
WHERE client.name LIKE :query COLLATE NOCASE
GROUP BY client.client_id''',
)
Stream<List> observeGetSearchClientByName(String query);
I use this method in dao class, but i had problem with russian symbols.

Stream<List<Client>> observeGetAllClientListSearchByName(String query) {
log("ClientRepositoryResultBefore->$query");
final searchQuery = '%${query}%';
log("ClientRepositoryResult->$searchQuery");
return clientDao
    .observeGetSearchClientByName(searchQuery)
    .asyncMap((event) => event.map((e) => e.toClient()).toList());

}

this my method which call observeGetSearchClientByName in other classes. For example I start to search word such as Па, this word find successfully, but when i search па word it does not find. I applied various solution for fixing this problem, For example i wrapped name and query but it does not find. How can fix it . This code only does not work in iphone, android phones work correct query only iphone have problem
.