Perhaps you should try some spelling variations:
"der universiteit amsterdam" » "de universiteit amsterdam", "der universitat amsterdam", "der universitaet amsterdam"
"vu universiteit amsterdam" » "de universiteit amsterdam", "v universite amsterdam", "vi universite amsterdam"

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"vu universiteit amsterdam\") OR (\"der universiteit amsterdam\"))".
• Removing quotes may allow a broader search: (( vu universiteit amsterdam ) OR ( der universiteit amsterdam )).
• Adding a wildcard symbol may retrieve word variants: (("vu universiteit amsterdam") OR ("der universiteit amsterdam"))*.