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[base SQL] concatenate with empty fields?

The following SQL-code is working, but not for entry's with empty fields. If the field 'voorvoegsel' (dutch for prefix last name) is empty, there's no result. Other entry's are shown. If i use only the title (aanhef) and first name (voornaam) every entry is shown.

How can i get results when one field is empty?

"contacten"."Aanhef" ||' '|| "contacten"."Voornaam" ||' '|| "contacten"."Voorvoegsel" ||' '|| "contacten"."Achternaam" 
FROM "contacten" 
ORDER BY "contacten"."Voornaam" ASC