Perhaps you should try some spelling variations:
petruiv » peteruiv (Expand Search), petriuiv (Expand Search), petruuiv (Expand Search)
petruov » peteruov (Expand Search), petriuov (Expand Search), petruuov (Expand Search)
petroi » peteroi (Expand Search), petrioi (Expand Search), petruoi (Expand Search)
petruiuui » peteruiuui (Expand Search), petriuiuui (Expand Search), petruuiuui (Expand Search)
petriuiuui » peteriuiuui (Expand Search), petriiuiuui (Expand Search), petruiuiuui (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 ((petruiv OR petruov) OR ((petroi OR (petruiuui OR petriuiuui)) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petruiv OR petruov) OR ((petroi OR (petruiuui OR petriuiuui)) OR petr)) o.s.*".