Perhaps you should try some spelling variations:
petra » petru (Expand Search), petro (Expand Search), petre (Expand Search), petera (Expand Search), petrua (Expand Search), petroa (Expand Search)
petrov » petro (Expand Search), peterov (Expand Search), petruov (Expand Search), petroov (Expand Search)
petera » peter (Expand Search)
petris » peteris (Expand Search), petruis (Expand Search), petrois (Expand Search)
petr » peter (Expand Search), petru (Expand Search), petro (Expand Search)
petrou » peterou (Expand Search), petruou (Expand Search), petroou (Expand Search), petru (Expand Search), petro (Expand Search), petrow (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (Expand Search)
peters » peter (Expand Search), petersen (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 (((petra OR petrov) OR petera) OR petr)) OR ((peters OR petrou) OR petri)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petris OR (((petra OR petrov) OR petera) OR petr)) OR ((peters OR petrou) OR petri)) o.s.*".