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Pass a comma-delimited list via the taxonomies query string param. Make sure that the request path is URL encoded - e.g.:
curl GET 'https://backstage.taboola.com/backstage/api/1.0/operations/thirdparty/image?taxonomies=Obama,%22White%20House%22'

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To submit non-English keywords:
Check that your desired language is supported. (See the Dictionary.) Include the language query string param with the desired value.
If you omit the language param and submit non-English keywords, the API may return very few results - or incorrect results.