Perhaps you should try some spelling variations:
zen » zehn, zeng
zend » zehnd, zengd, end, tend, send
zehen » gehen, zehn
zehend » gehend, zehnd, behend, sehend, zeheng
sehen » gehen
gehend » gehende, gehenden

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (zen OR ((zehen OR sehen) OR ((zehend OR zend) OR gehend))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(zen or ((zehen OR sehen) or ((zehend or zend) or gehend)))".
• Adding a wildcard symbol may retrieve word variants: (zen or ((zehen OR sehen) or ((zehend or zend) or gehend)))*.