Perhaps you should try some spelling variations:
petrov » petro (Expand Search), petroov (Expand Search), perov (Expand Search)
petru » pentru (Expand Search), petrou (Expand Search), peru (Expand Search)
petrui » pentrui (Expand Search), petroui (Expand Search), perui (Expand Search)
peteri » peterdi (Expand Search), peters (Expand Search)
peterio » peterdio (Expand Search), peterso (Expand Search)
petr » petro (Expand Search), per (Expand Search)
petri » petroi (Expand Search), peri (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 (((petru OR (petrui OR peteri)) OR peterio) OR ((petr OR petri) OR peter))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (petrov OR (((petru OR (petrui OR peteri)) OR peterio) OR ((petr OR petri) OR peter))) o.s.*".