Perhaps you should try some spelling variations:
petrv » petrov (Expand Search), petri (Expand Search), petru (Expand Search), petriv (Expand Search), petruv (Expand Search)
peterov » petrov (Expand Search)
petr » petri (Expand Search), petru (Expand Search), petro (Expand Search)
petruouo » petriuouo (Expand Search), petruuouo (Expand Search), petrououo (Expand Search)
petrioi » petriioi (Expand Search), petruioi (Expand Search), petroioi (Expand Search)
peteri » peterdi (Expand Search), petri (Expand Search), peters (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 ((petrv OR peterov) OR (((petr OR petruouo) OR (petrioi OR peteri)) OR peter)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petrv OR peterov) OR (((petr OR petruouo) OR (petrioi OR peteri)) OR peter)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petrv OR peterov) OR (((petr OR petruouo) OR (petrioi OR peteri)) OR peter)) o.s.*.