Perhaps you should try some spelling variations:
petruv » petrov (Expand Search), pentruv (Expand Search), peteruv (Expand Search), petrouv (Expand Search)
petru » pentru (Expand Search), peteru (Expand Search), petrou (Expand Search)
petrui » pentrui (Expand Search), peterui (Expand Search), petroui (Expand Search)
petriiiv » peteriiiv (Expand Search), petroiiiv (Expand Search)
petrouo » peterouo (Expand Search), petroouo (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 ((petriiiv OR petruv) OR (((petru OR petrui) OR (petrouo OR petr)) OR (per OR petri))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petriiiv OR petruv) OR (((petru OR petrui) OR (petrouo OR petr)) OR (per OR petri))) o.s.*".