Perhaps you should try some spelling variations:
petrov » petro (Expand Search), petriov (Expand Search), petroov (Expand Search)
petero » peters (Expand Search), petro (Expand Search)
petruo » petro (Expand Search), pentruo (Expand Search), petrio (Expand Search), petriuo (Expand Search), petrouo (Expand Search)
petru » pentru (Expand Search), petri (Expand Search), petriu (Expand Search), petrou (Expand Search)
petriiuo » petriiiuo (Expand Search), petroiiuo (Expand Search)
petr » petri (Expand Search), petro (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 (petrov OR (((petero OR (petruo OR petriiuo)) OR (petru OR (per OR petr))) OR peter)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (petrov OR (((petero OR (petruo OR petriiuo)) OR (petru OR (per OR petr))) OR peter)) o.s.*".