Perhaps you should try some spelling variations:
petr » peter (Expand Search), petru (Expand Search), petro (Expand Search)
petroou » peteroou (Expand Search), petruoou (Expand Search), petrooou (Expand Search)
petrv » peterv (Expand Search), petruv (Expand Search), petrov (Expand Search), petru (Expand Search), petro (Expand Search)
petroov » peteroov (Expand Search), petruoov (Expand Search), petrooov (Expand Search), petrov (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (Expand Search)
peters » peter (Expand Search), petersen (Expand Search)
peterv » peter (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 (((((petr OR petroou) OR peters) OR (petrv OR peterv)) OR (periv OR petroov)) OR petri) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((((petr OR petroou) OR peters) OR (petrv OR peterv)) OR (periv OR petroov)) OR petri) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (((((petr OR petroou) OR peters) OR (petrv OR peterv)) OR (periv OR petroov)) OR petri) o.s.*.