Perhaps you should try some spelling variations:
petrou » petro (Expand Search), petrow (Expand Search), petroou (Expand Search), perou (Expand Search)
peters » petersen (Expand Search)
petruio » pentruio (Expand Search), petrouio (Expand Search), peruio (Expand Search)
petru » pentru (Expand Search), petrou (Expand Search), peru (Expand Search)
petrov » petro (Expand Search), petroov (Expand Search), perov (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 (((peter OR petrou) OR peters) OR (petruio OR (((petru OR petrov) OR petr) OR petri))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((peter OR petrou) OR peters) OR (petruio OR (((petru OR petrov) OR petr) OR petri))) o.s.*".