Perhaps you should try some spelling variations:
petr » peter (Expand Search), petro (Expand Search), per (Expand Search)
petrov » peterov (Expand Search), petroov (Expand Search), perov (Expand Search), petro (Expand Search)
petriou » peteriou (Expand Search), petroiou (Expand Search), periou (Expand Search)
petru » peteru (Expand Search), petrou (Expand Search), peru (Expand Search), pentru (Expand Search)
petri » peteri (Expand Search), petroi (Expand Search), peri (Expand Search)
peters » peter (Expand Search), petersen (Expand Search)

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (petr OR (((petrov OR petriou) OR peterou) OR ((petru OR petri) OR peters))) _. s.~".
• Adding a wildcard symbol may retrieve word variants: fop (petr OR (((petrov OR petriou) OR peterou) OR ((petru OR petri) OR peters))) _. s.*.