Perhaps you should try some spelling variations:
petruov » petrov (Expand Search), pentruov (Expand Search), petriov (Expand Search), petriuov (Expand Search), petrouov (Expand Search), peruov (Expand Search)
petriov » petrov (Expand Search), petriiov (Expand Search), petroiov (Expand Search), periov (Expand Search)
petroiv » petrov (Expand Search), petrioiv (Expand Search), petrooiv (Expand Search), peroiv (Expand Search)
peterov » petrov (Expand Search), petersv (Expand Search)
petru » pentru (Expand Search), petri (Expand Search), petriu (Expand Search), petrou (Expand Search), peru (Expand Search)
petero » peters (Expand Search), petro (Expand Search)
petr » petri (Expand Search), petro (Expand Search), per (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 ((((petruov OR petriov) OR petroiv) OR peterov) OR ((petru OR petero) OR (petr OR peter))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((petruov OR petriov) OR petroiv) OR peterov) OR ((petru OR petero) OR (petr OR peter))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((((petruov OR petriov) OR petroiv) OR peterov) OR ((petru OR petero) OR (petr OR peter))) o.s.*.