Using foreign characters in odata filter

I’m trying to retrieve data from odata source:
https://xxxxxxxx.crm4.dynamics.com/xrmservices/2011/OrganizationData.svc/ContactSet?$select=FirstName,JobTitle,LastName&$filter=FirstName eq 'משה'

Get empty results no error.If I change the name in the contact entity to "Moshe":

https://xxxxxxxx.crm4.dynamics.com/xrmservices/2011/OrganizationData.svc/ContactSet?$select=FirstName,JobTitle,LastName&$filter=FirstName eq  'Moshe'

I’m getting good result. I try this in JS code and directly in the URL and getting the same results.

Its look like some encoding syntax, but I couldn't find any document/blog on the subject.

Any help will be appreciated.