Perhaps you should try some spelling variations:
heinzrich fink » heinrich fink (Expand Search)
heinzke » heinke (Expand Search), heinzzke (Expand Search), einzke (Expand Search), meinzke (Expand Search)
heink » heinke (Expand Search), heinz (Expand Search), heine (Expand Search), heinzk (Expand Search), eink (Expand Search), meink (Expand Search)
heinzrich » heinzzrich (Expand Search), einzrich (Expand Search), meinzrich (Expand Search)
hein » heinz (Expand Search), ein (Expand Search), mein (Expand Search)

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((heinzrich (eine OR (heinzke OR (heink OR hein)))) OR (heinzrich fink)) universitat dusseldorf~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((heinzrich (eine OR (heinzke OR (heink OR hein)))) OR (heinzrich fink)) universitat dusseldorf".
• Adding a wildcard symbol may retrieve word variants: ((heinzrich (eine OR (heinzke OR (heink OR hein)))) OR (heinzrich fink)) universitat dusseldorf*.