Perhaps you should try some spelling variations:
petruov » petrov (Expand Search), petrouov (Expand Search), peruov (Expand Search), pentruov (Expand Search)
peterv » peters (Expand Search)
petrio » petris (Expand Search), petro (Expand Search), petroio (Expand Search), perio (Expand Search)
petriuv » petroiuv (Expand Search), periuv (Expand Search)
petr » petro (Expand Search), per (Expand Search)
petru » petrou (Expand Search), peru (Expand Search), pentru (Expand Search)
petri » petroi (Expand Search), peri (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 (((petruov OR peterv) OR petriuv) OR (petrio OR ((petr OR (petru OR petri)) OR peter))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petruov OR peterv) OR petriuv) OR (petrio OR ((petr OR (petru OR petri)) OR peter))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (((petruov OR peterv) OR petriuv) OR (petrio OR ((petr OR (petru OR petri)) OR peter))) o.s.*.