ormlite change characters with question marks

I use of following query in ormlite with Mysql:

String _textSearch="%اعصاب%";
Where<QuestionEntity, Long> _where= getDao().queryBuilder()).where();

List<QuestionEntity> _lst= _where.or(_where.like("title",_textSearch ),
    _where.like("questiontext", _textSearch)).query();

but generate following query:

SELECT * FROM `question`
    WHERE (`title` LIKE '%?????%' OR `questiontext` LIKE '%?????%' )

why ?