Perhaps you should try some spelling variations:
petero » petro (Expand Search)
peters » petersen (Expand Search)
peteru » petru (Expand Search)
petruo » petru (Expand Search), petro (Expand Search), petruuo (Expand Search), petrouo (Expand Search), peruo (Expand Search)
petriuo » petruiuo (Expand Search), petroiuo (Expand Search), periuo (Expand Search)
petr » petru (Expand Search), petro (Expand Search), per (Expand Search)
petri » petrui (Expand Search), petroi (Expand Search), peri (Expand Search)

Try widening your search to All Fields.

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 (((((petero OR peters) OR peteru) OR petruo) OR petriuo) OR (petr OR petri))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (peter OR (((((petero OR peters) OR peteru) OR petruo) OR petriuo) OR (petr OR petri))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (peter OR (((((petero OR peters) OR peteru) OR petruo) OR petriuo) OR (petr OR petri))) o.s.*.