Ok so Chrome is handling the spaces for you but is still sending literal double quotes where it should be sending %22 instead.
I have a post at Bes Properties that are not set or unkown causing relevance query issue on using Curl more easily by keeping the query in a text file and having Curl do the url-encoding automatically for you.
To use the query in a browser URL directly, try using an online utility like https://www.urlencoder.org/ to generate the URL-encoded version of your query.
If you feed it
(display name of site of source fixlet of it | "n/a") of bes actions
It returns
%28display%20name%20of%20site%20of%20source%20fixlet%20of%20it%20%7C%20%22n%2Fa%22%29%20of%20bes%20actions
So you could give that a try for the ‘relevance=’ value