Perhaps you should try some spelling variations:
petroov » petrov (Expand Search), peteroov (Expand Search), petrooov (Expand Search), peroov (Expand Search)
peterov » petrov (Expand Search)
petru » pentru (Expand Search), peteru (Expand Search), petrou (Expand Search), peru (Expand Search)
petera » peter (Expand Search), peters (Expand Search), petra (Expand Search)
petroiv » petrov (Expand Search), peteroiv (Expand Search), petrooiv (Expand Search), peroiv (Expand Search)
petrouv » petrov (Expand Search), peterouv (Expand Search), petroouv (Expand Search), perouv (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 ((((petroov OR peterov) OR ((petru OR petera) OR petroiv)) OR petrouv) OR (petr OR petri)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((petroov OR peterov) OR ((petru OR petera) OR petroiv)) OR petrouv) OR (petr OR petri)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((((petroov OR peterov) OR ((petru OR petera) OR petroiv)) OR petrouv) OR (petr OR petri)) o.s.*.