Perhaps you should try some spelling variations:
petrouv » petrov (Expand Search), peterouv (Expand Search), petruouv (Expand Search), petroouv (Expand Search)
petriov » petrov (Expand Search), peteriov (Expand Search), petruiov (Expand Search), petroiov (Expand Search)
petruiiov » petruiov (Expand Search), peteruiiov (Expand Search), petruuiiov (Expand Search), petrouiiov (Expand Search)
petrui » petru (Expand Search), peterui (Expand Search), petruui (Expand Search), petroui (Expand Search)
petrioui » peterioui (Expand Search), petruioui (Expand Search), petroioui (Expand Search)
petr » peter (Expand Search), petru (Expand Search), petro (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (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 ((petrouv OR (petriov OR petruiiov)) OR ((petrui OR petrioui) OR (petr OR petri))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petrouv OR (petriov OR petruiiov)) OR ((petrui OR petrioui) OR (petr OR petri))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petrouv OR (petriov OR petruiiov)) OR ((petrui OR petrioui) OR (petr OR petri))) o.s.*.