Perhaps you should try some spelling variations:
petriow » petrow (Expand Search), peteriow (Expand Search), petriiow (Expand Search), petruiow (Expand Search)
petruw » petru (Expand Search), petrow (Expand Search), peteruw (Expand Search), petriuw (Expand Search), petruuw (Expand Search)
petrivw » peterivw (Expand Search), petriivw (Expand Search), petruivw (Expand Search)
petr » peter (Expand Search), petri (Expand Search), petru (Expand Search)
petruov » peteruov (Expand Search), petriuov (Expand Search), petruuov (Expand Search), petrov (Expand Search)
peterov » petrov (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: fop (((((petriow OR petriow) OR petruw) OR petrivw) o) OR ((petr OR (petruov OR peterov)) _)). s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((((petriow OR petriow) OR petruw) OR petrivw) o) OR ((petr OR (petruov OR peterov)) _)). s.".
• Adding a wildcard symbol may retrieve word variants: fop (((((petriow OR petriow) OR petruw) OR petrivw) o) OR ((petr OR (petruov OR peterov)) _)). s.*.