Perhaps you should try some spelling variations:
petruov » peteruov (Expand Search), petrouov (Expand Search), peruov (Expand Search)
petru » peteru (Expand Search), petrou (Expand Search), peru (Expand Search)
petruo » peteruo (Expand Search), petrouo (Expand Search), peruo (Expand Search)
petruui » peteruui (Expand Search), petrouui (Expand Search), peruui (Expand Search)
petri » peteri (Expand Search), petroi (Expand Search), peri (Expand Search)
petr » peter (Expand Search), petro (Expand Search), per (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 ((peterov OR petruov) OR ((((petru OR petruo) OR petero) OR (petruui OR petri)) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((peterov OR petruov) OR ((((petru OR petruo) OR petero) OR (petruui OR petri)) OR petr)) o.s.*".