Perhaps you should try some spelling variations:
zen » zehn
zeng » zehng, eng, feng, peng
zeheng » zehend, geheng, seheng, zehng
zehng » zehn, zehnt, zehnj
zhenheng » zhencheng, zhensheng, zhenhong
gehend » gehende, gehenden
zehen » gehen, sehen, zehn

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 zeng) OR (((zeheng OR zehng) OR zhenheng) OR (gehend OR zehen))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((zen or zeng) or (((zeheng OR zehng) or zhenheng) or (gehend or zehen)))".
• Adding a wildcard symbol may retrieve word variants: ((zen or zeng) or (((zeheng OR zehng) or zhenheng) or (gehend or zehen)))*.