How to use lucene query to search for posts?

[Apolos7]

Hello,

I'm trying to perform a more targeted search for posts and I noticed that in the documentation the search parameter accepts Lucene queries, however, when trying to use the query below I didn't get any results.

('reforma tributária' OR 'cortes de gastos' OR 'reforma fiscal')

I'm using the Apache Lucene 2.9.4 documentation as a reference.

Thank you for your time. I look forward to your response.
Best regards,
Alessandro