Perhaps you should try some spelling variations:
petrov » petro (Expand Search), petriov (Expand Search), petroov (Expand Search), perov (Expand Search)
petris » petri (Expand Search), petriis (Expand Search), petrois (Expand Search), peris (Expand Search)
petru » pentru (Expand Search), petri (Expand Search), petriu (Expand Search), petrou (Expand Search), peru (Expand Search)
petrui » pentrui (Expand Search), petrii (Expand Search), petriui (Expand Search), petroui (Expand Search), perui (Expand Search), petri (Expand Search)
petr » petri (Expand Search), petro (Expand Search), per (Expand Search)
petrioi » petriioi (Expand Search), petroioi (Expand Search), perioi (Expand Search)
petriioi » petriiioi (Expand Search), petroiioi (Expand Search), periioi (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 ((petris OR petru) OR (petr OR (((petrioi OR petriioi) OR petrui) OR peter)))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (petrov OR ((petris OR petru) OR (petr OR (((petrioi OR petriioi) OR petrui) OR peter)))) o.s.*".