How to make sure the Profile search works also with 2 words

If I go to this page: https://snvt.nl/professioneel-vertaler-of-tolk-inhuren/
And I do a search.

Then I put for instance a first name and a second name of an existing member in the search area, it will give no results.

If I search for ‘Margriet’, I will get 1 result
If I search for ‘Hunter’, I will get 1 result too.
If I search for ‘Margriet Hunter’, I will get 0 results.

What can I do to make the search ‘Margriet OR Hunter’?

The page I need help with: [log in to see the link]