Perhaps you should try some spelling variations:
peters » petersen (Expand Search)
petrou » petru (Expand Search), petro (Expand Search), petrov (Expand Search), petruou (Expand Search), petroou (Expand Search), perou (Expand Search)
petruo » petru (Expand Search), petro (Expand Search), petruuo (Expand Search), petrouo (Expand Search), peruo (Expand Search)
petroouo » petruoouo (Expand Search), petrooouo (Expand Search), peroouo (Expand Search)
petr » petru (Expand Search), petro (Expand Search), per (Expand Search)
petri » petrui (Expand Search), 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 ((peruv OR peters) OR ((petrou OR (petruo OR petroouo)) OR ((petr OR peter) OR petri))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((peruv OR peters) OR ((petrou OR (petruo OR petroouo)) OR ((petr OR peter) OR petri))) o.s.*".