Perhaps you should try some spelling variations:
zen » zehn, zeng
zend » zehnd, zengd, end, tend, send
peng » png, pen
zehen » sehen, zehn
zehend » sehend, zehnd, behend, zeheng
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 peng) OR ((zehen OR gehen) OR ((zehend OR zend) OR gehend))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((zen or peng) or ((zehen OR gehen) or ((zehend or zend) or gehend)))".
• Adding a wildcard symbol may retrieve word variants: ((zen or peng) or ((zehen OR gehen) or ((zehend or zend) or gehend)))*.