Perhaps you should try some spelling variations:
petro » petrov (Expand Search), petri (Expand Search), petru (Expand Search), petero (Expand Search), petrio (Expand Search), petruo (Expand Search)
petriov » peteriov (Expand Search), petriiov (Expand Search), petruiov (Expand Search)
petruiiuov » peteruiiuov (Expand Search), petriuiiuov (Expand Search), petruuiiuov (Expand Search)
petrio » peterio (Expand Search), petriio (Expand Search), petruio (Expand Search)
petruio » peteruio (Expand Search), petriuio (Expand Search), petruuio (Expand Search)
petr » peter (Expand Search), petri (Expand Search), petru (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 (((petriov OR peteruiov) OR petruiiuov) OR (((petro OR petrio) OR petruio) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petriov OR peteruiov) OR petruiiuov) OR (((petro OR petrio) OR petruio) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (((petriov OR peteruiov) OR petruiiuov) OR (((petro OR petrio) OR petruio) OR petr)) o.s.*.