If you have recent Dutch ancestors, you may not have a lot of matches when you take a DNA test since DNA testing is not that popular in the Netherlands.
To increase your chances of finding Dutch cousins, transfer your DNA results to other websites such as MyHeritage, FamilyTreeDNA, and GedMatch. Testing at Ancestry and 23andMe can also increase your chances of finding matches, since those companies don’t accept uploads.
See the article Dutch DNA Testing Strategy for more information.