Perhaps you should try some spelling variations:
petruv » petrov (Expand Search), pentruv (Expand Search), peteruv (Expand Search), petrouv (Expand Search)
peteri » peterdi (Expand Search), peter (Expand Search), peters (Expand Search)
petruiiuv » pentruiiuv (Expand Search), peteruiiuv (Expand Search), petrouiiuv (Expand Search)
petru » pentru (Expand Search), peteru (Expand Search), petrou (Expand Search)
petero » peter (Expand Search), peters (Expand Search), petro (Expand Search)
petri » peteri (Expand Search), petroi (Expand Search)
petr » peter (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 ((petruv OR petruiiuv) OR ((((petri OR peteri) OR petru) OR petero) OR (petr OR per))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petruv OR petruiiuv) OR ((((petri OR peteri) OR petru) OR petero) OR (petr OR per))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petruv OR petruiiuv) OR ((((petri OR peteri) OR petru) OR petero) OR (petr OR per))) o.s.*.