Perhaps you should try some spelling variations:
petrv » petrov (Expand Search), petro (Expand Search), petra (Expand Search), perv (Expand Search)
petru » pentru (Expand Search), petrou (Expand Search), peru (Expand Search)
petrovu » petrov (Expand Search), petroovu (Expand Search), perovu (Expand Search)
petris » petrois (Expand Search), peris (Expand Search)
petri » petroi (Expand Search), peri (Expand Search)
petriu » petroiu (Expand Search), periu (Expand Search)
petr » petro (Expand Search), per (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 ((petris OR petrv) OR (((petru OR (petrovu OR petri)) OR petriu) OR (petr OR peter))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petris OR petrv) OR (((petru OR (petrovu OR petri)) OR petriu) OR (petr OR peter))) o.s.*".