Zoho CRM Search API always returns empty body

Zoho CRM Search API always returns empty body

Hello,
I'd like to find a contact using the Zoho CRM search API. 
I passed all the Oauth2 steps, I can list my invoices for example.

But when I try I always have an empty response. Nothing in the body.

curl "https://www.zohoapis.com/crm/v2/contacts/search?word=publi&org_id=123456" -X GET -H "A
uthorization: Zoho-oauthtoken 1000.XXXX.XXXX"

The scope of the token I use is : 
- ZohoBooks.invoices.CREATE
- ZohoSearch.securesearch.READ
- ZohoBooks.invoices.READ
- ZohoCRM.coql.READ
- ZohoCRM.modules.all

(I tried several things)

So maybe the issue come from my scope which is not allowed to READ contacts data.

Then I tried 
curl "https://www.zohoapis.com/crm/v2/invoices/search?word=publi&org_id=123456" -X GET -H "A
uthorization: Zoho-oauthtoken 1000.XXXX.XXXX"

And the response is the same, empty. No error, no JSON, nothing...

Thank you for the help