Perhaps you should try some spelling variations:
petriov » petrov (Expand Search), petriiov (Expand Search), petruiov (Expand Search), petroiov (Expand Search)
petruiv » petriuiv (Expand Search), petruuiv (Expand Search), petrouiv (Expand Search)
petruuiv » petriuuiv (Expand Search), petruuuiv (Expand Search), petrouuiv (Expand Search)
petriiiv » petriiiiv (Expand Search), petruiiiv (Expand Search), petroiiiv (Expand Search)
petriiiov » petriiiiov (Expand Search), petruiiiov (Expand Search), petroiiiov (Expand Search)
petr » petri (Expand Search), petru (Expand Search), petro (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 ((((petruiv OR petruuiv) OR petriiiv) OR petriiiov) OR (petriov OR (petr OR peter))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((petruiv OR petruuiv) OR petriiiv) OR petriiiov) OR (petriov OR (petr OR peter))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((((petruiv OR petruuiv) OR petriiiv) OR petriiiov) OR (petriov OR (petr OR peter))) o.s.*.