Perhaps you should try some spelling variations:
petruv » petrov (Expand Search), pentruv (Expand Search), petriv (Expand Search)
peterov » petrov (Expand Search)
pero » petro (Expand Search), per (Expand Search), pro (Expand Search)
petrui » petri (Expand Search), pentrui (Expand Search), petrii (Expand Search)
petruo » petro (Expand Search), pentruo (Expand Search), petrio (Expand Search)
petruuo » pentruuo (Expand Search), petriuo (Expand Search)
petru » pentru (Expand Search), petri (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 ((petruv OR peterov) OR (((pero OR petrui) OR ((petruo OR petruuo) OR petru)) OR petrui)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petruv OR peterov) OR (((pero OR petrui) OR ((petruo OR petruuo) OR petru)) OR petrui)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petruv OR peterov) OR (((pero OR petrui) OR ((petruo OR petruuo) OR petru)) OR petrui)) o.s.*.