I am using `kagi` as my search engine. While reading the article I searched `sur:fmc` [0]. The first result was a site that gives information about search urls [1] and gives correct description of what is the function of `sur:fmc`. I couldn't find this page on the first 5 pages on google [2] (and didn't look further). Not to mention google trying to correct me the query text.
[0] https://kagi.com/search?q=sur%3Afmc
[1] https://sites.google.com/a/arps.org/esresearch/images
[2] https://www.google.com/search?q=sur%3Afmc