Perhaps you should try some spelling variations:
peteriiv » peterdi (Expand Search)
petruuiiiv » peteruuiiiv (Expand Search), petriuuiiiv (Expand Search), petruuuiiiv (Expand Search)
petroi » peteroi (Expand Search), petrioi (Expand Search), petruoi (Expand Search)
petruov » peteruov (Expand Search), petriuov (Expand Search), petruuov (Expand Search)
petriuv » peteriuv (Expand Search), petriiuv (Expand Search), petruiuv (Expand Search)
petr » peter (Expand Search), petri (Expand Search), petru (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 ((peteriv OR (peteriiv OR petruuiiiv)) OR ((petroi OR (petruov OR petriuv)) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((peteriv OR (peteriiv OR petruuiiiv)) OR ((petroi OR (petruov OR petriuv)) OR petr)) o.s.*".