Search organization with custom field key "type"

Hello,

We have a custom organization field with field key "type".

I try to search organizations with text in this field, but the url is like so :

https://xxx.zendesk.com/api/v2/search.json?query=type:organization type:MQL

And the repetition of "type" is not helping i guess, it gives me all organizations i have instead of just organization with this type...

How can i do ?

Thanks for the help.

Pauline.