Perhaps you should try some spelling variations:
petriov » petrov (Expand Search), peteriov (Expand Search), petroiov (Expand Search), periov (Expand Search)
petrv » petrov (Expand Search), petro (Expand Search), petra (Expand Search), peterv (Expand Search), perv (Expand Search)
petru » pentru (Expand Search), peteru (Expand Search), petrou (Expand Search), peru (Expand Search)
petruv » pentruv (Expand Search), petrov (Expand Search), peteruv (Expand Search), petrouv (Expand Search), peruv (Expand Search)
petriiiv » peteriiiv (Expand Search), petroiiiv (Expand Search), periiiv (Expand Search)
petr » peter (Expand Search), petro (Expand Search), per (Expand Search)
petri » peteri (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 (((petriov OR ((petrv OR petru) OR petruv)) OR petriiiv) OR (petr OR petri)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petriov OR ((petrv OR petru) OR petruv)) OR petriiiv) OR (petr OR petri)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (((petriov OR ((petrv OR petru) OR petruv)) OR petriiiv) OR (petr OR petri)) o.s.*.