Perhaps you should try some spelling variations:
"heinrich heinz" » "enrich heinz" (Expand Search)
"heinrich hein" » "enrich hein" (Expand Search)
"zheinrich hsin" » "zenrich hsin" (Expand Search), "henrich hsin" (Expand Search), "zheinrich hskin" (Expand Search), "zheinrich hspin" (Expand Search)
"zenrich sin" » "enrich sin" (Expand Search), "genrich sin" (Expand Search), "henrich sin" (Expand Search), "zenrich skin" (Expand Search), "zenrich spin" (Expand Search)

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("heinrich heinz") OR ((("heinrich hein") OR ((("zheinrich hsin") OR ("zenrich sin"))))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"heinrich heinz\") OR (((\"heinrich hein\") OR (((\"zheinrich hsin\") OR (\"zenrich sin\"))))))".
• Removing quotes may allow a broader search: (( heinrich heinz ) OR ((( heinrich hein ) OR ((( zheinrich hsin ) OR ( zenrich sin )))))).
• Adding a wildcard symbol may retrieve word variants: (("heinrich heinz") OR ((("heinrich hein") OR ((("zheinrich hsin") OR ("zenrich sin"))))))*.