Perhaps you should try some spelling variations:
petroiv » petrov (Expand Search), peteroiv (Expand Search), petrooiv (Expand Search)
petruuiv » pentruuiv (Expand Search), peteruuiv (Expand Search), petrouuiv (Expand Search)
petru » pentru (Expand Search), peteru (Expand Search), petrou (Expand Search)
petrio » petris (Expand Search), petro (Expand Search), peterio (Expand Search), petroio (Expand Search)
petriuiv » peteriuiv (Expand Search), petroiuiv (Expand Search)
petr » peter (Expand Search), petro (Expand Search)
petri » peteri (Expand Search), petroi (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 ((petroiv OR (petruuiv OR petriuiv)) OR ((petru OR petrio) OR ((petr OR per) OR petri))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petroiv OR (petruuiv OR petriuiv)) OR ((petru OR petrio) OR ((petr OR per) OR petri))) o.s.*".