Perhaps you should try some spelling variations:
petrouv » petrov (Expand Search), peterouv (Expand Search), petruouv (Expand Search), petroouv (Expand Search)
petero » peter (Expand Search), peters (Expand Search), petro (Expand Search)
petersou » petersen (Expand Search), peters (Expand Search)
petriuv » peteriuv (Expand Search), petruiuv (Expand Search), petroiuv (Expand Search)
petr » peter (Expand Search), petru (Expand Search), petro (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (Expand Search)

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 petriuv) OR (((petero OR peterio) OR petersou) OR (petr OR petri))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petrouv OR petriuv) OR (((petero OR peterio) OR petersou) OR (petr OR petri))) o.s.*".