Perhaps you should try some spelling variations:
petroiv » petrov (Expand Search), petrioiv (Expand Search), petruoiv (Expand Search), petrooiv (Expand Search)
petriov » petrov (Expand Search), petriiov (Expand Search), petruiov (Expand Search), petroiov (Expand Search)
petriuuov » petriiuuov (Expand Search), petruiuuov (Expand Search), petroiuuov (Expand Search)
petriiv » petriiiv (Expand Search), petruiiv (Expand Search), petroiiv (Expand Search)
petruuo » petriuuo (Expand Search), petruuuo (Expand Search), petrouuo (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 ((petriuuov OR ((petroiv OR petriiv) OR petriov)) OR (petruuo OR (petr OR peter))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petriuuov OR ((petroiv OR petriiv) OR petriov)) OR (petruuo OR (petr OR peter))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petriuuov OR ((petroiv OR petriiv) OR petriov)) OR (petruuo OR (petr OR peter))) o.s.*.