Perhaps you should try some spelling variations:
welser » belser (Expand Search), elser (Expand Search), welter (Expand Search)
wolter » walter (Expand Search), zwolfter (Expand Search)
wieselr » wiesel (Expand Search), wiesellr (Expand Search), wiegelr (Expand Search), gieselr (Expand Search)
wiener » wieder (Expand Search)
wiese » wiesel (Expand Search), wiege (Expand Search), giese (Expand Search)
wieser » wieselr (Expand Search), wieger (Expand Search), gieser (Expand Search), wieder (Expand Search), dieser (Expand Search), weser (Expand Search)

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((dieses OR (welser OR wolter)) OR (((wieselr OR wiener) OR (wiese OR wieser)) OR diesem)) muller~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((dieses OR (welser OR wolter)) OR (((wieselr OR wiener) OR (wiese OR wieser)) OR diesem)) muller".
• Adding a wildcard symbol may retrieve word variants: ((dieses OR (welser OR wolter)) OR (((wieselr OR wiener) OR (wiese OR wieser)) OR diesem)) muller*.