Perhaps you should try some spelling variations:
petroi » petro (Expand Search), petrov (Expand Search), petrow (Expand Search), petruoi (Expand Search), petrooi (Expand Search)
petrv » petrov (Expand Search), petru (Expand Search), petro (Expand Search), petruv (Expand Search)
petriow » petrow (Expand Search), petruiow (Expand Search), petroiow (Expand Search)
petriu » petru (Expand Search), petris (Expand Search), petruiu (Expand Search), petroiu (Expand Search)
petri » petrui (Expand Search), petroi (Expand Search)
petr » petru (Expand Search), petro (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 (((per OR petroi) OR petrv) OR (((petri OR petriow) OR petriu) OR (petr OR peter))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((per OR petroi) OR petrv) OR (((petri OR petriow) OR petriu) OR (petr OR peter))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (((per OR petroi) OR petrv) OR (((petri OR petriow) OR petriu) OR (petr OR peter))) o.s.*.