Perhaps you should try some spelling variations:
zen » zeng
zehend » gehend, sehend, zehender
zhenheng » zhencheng, zhensheng, zhenhong
behend » behende, gehend, beheld
zeheng » geheng, seheng
zehen » gehen, sehen

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