Perhaps you should try some spelling variations:
petriov » petrov (Expand Search), peteriov (Expand Search), petruiov (Expand Search), petroiov (Expand Search)
petrou » petru (Expand Search), petro (Expand Search), petrov (Expand Search), peterou (Expand Search), petruou (Expand Search), petroou (Expand Search)
petruuiov » peteruuiov (Expand Search), petruuuiov (Expand Search), petrouuiov (Expand Search)
petruuuiov » peteruuuiov (Expand Search), petruuuuiov (Expand Search), petrouuuiov (Expand Search)
petruiv » peteruiv (Expand Search), petruuiv (Expand Search), petrouiv (Expand Search)
petr » peter (Expand Search), petru (Expand Search), petro (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (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 (petruuiov OR petruuuiov)) OR petruiv) OR (petrou OR (petr OR petri))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petriov OR (petruuiov OR petruuuiov)) OR petruiv) OR (petrou OR (petr OR petri))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (((petriov OR (petruuiov OR petruuuiov)) OR petruiv) OR (petrou OR (petr OR petri))) o.s.*.