Perhaps you should try some spelling variations:
heron » herrn, heran, hern, heren
hern » herrn, her, here
hearn » hearne, learn, heard
hearder » harder, header, hearer
hero » her, here
herz » her, here

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: (((heron OR hern) OR ((hearn OR heart) OR hearder)) OR (hero OR herz)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((heron or hern) or ((hearn OR heart) or hearder)) or (hero or herz))".
• Adding a wildcard symbol may retrieve word variants: (((heron or hern) or ((hearn OR heart) or hearder)) or (hero or herz))*.