Perhaps you should try some spelling variations:
petriow » petrow (Expand Search), peteriow (Expand Search), petriiow (Expand Search), petruiow (Expand Search)
peterov » petrov (Expand Search)
peterow » petrow (Expand Search)
petr » peter (Expand Search), petri (Expand Search), petru (Expand Search)
petroi » peteroi (Expand Search), petrioi (Expand Search), petruoi (Expand Search), petri (Expand Search), petro (Expand Search), petrov (Expand Search)
petriui » peteriui (Expand Search), petriiui (Expand Search), petruiui (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: fop (((((petriow OR peterov) OR peterow) OR peterow) o) OR (((petr OR petroi) OR petriui) _)). s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((((petriow OR peterov) OR peterow) OR peterow) o) OR (((petr OR petroi) OR petriui) _)). s.*".