If you are searching for artist + title, you will frequently end up with more than 100 matches for popular songs. In this situation you may want to refine the search and supply more search criteria, but the standard discogs searches only support two search parameters.
For this use case you can construct your own custom search script for example to search for artist + title + country + mediatype by using the export script provided in Export configuration to build Discogs Custom Search Commands.
For example searching for
Bee Gees - New York Mining Disaster 1941
has more than 100 matches, whereas a search for
Bee Gees - New York Mining Disaster 1941 - UK - single
with the above suggested custom search produces only 6 matches.