Perhaps you should try some spelling variations:
petriov » petrov (Expand Search), petriiov (Expand Search), petruiov (Expand Search), petroiov (Expand Search)
petr » petri (Expand Search), petru (Expand Search), petro (Expand Search)
petroiu » petrioiu (Expand Search), petruoiu (Expand Search), petrooiu (Expand Search)
petroooiu » petrioooiu (Expand Search), petruoooiu (Expand Search), petrooooiu (Expand Search)
petrou » petriou (Expand Search), petruou (Expand Search), petroou (Expand Search), petru (Expand Search), petro (Expand Search), petrov (Expand Search)
petruoou » petriuoou (Expand Search), petruuoou (Expand Search), petrouoou (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 ((petr OR ((petroiu OR petroooiu) OR (petrou OR petruoou))) OR peter)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (petriov OR ((petr OR ((petroiu OR petroooiu) OR (petrou OR petruoou))) OR peter)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (petriov OR ((petr OR ((petroiu OR petroooiu) OR (petrou OR petruoou))) OR peter)) o.s.*.