Perhaps you should try some spelling variations:
petr » petri (Expand Search), petro (Expand Search), per (Expand Search)
petru » petriu (Expand Search), petrou (Expand Search), peru (Expand Search), pentru (Expand Search), petri (Expand Search)
petriv » petriiv (Expand Search), petroiv (Expand Search), periv (Expand Search), petri (Expand Search), petrov (Expand Search)
petris » petriis (Expand Search), petrois (Expand Search), peris (Expand Search), petri (Expand Search)
petriois » petriiois (Expand Search), petroiois (Expand Search), periois (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 ((petr OR peter) OR (petru OR (petriv OR (petris OR petriois)))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petr OR peter) OR (petru OR (petriv OR (petris OR petriois)))) o.s.*".