Perhaps you should try some spelling variations:
petrou » petru (Expand Search), petro (Expand Search), petrov (Expand Search), peterou (Expand Search), petriou (Expand Search), petruou (Expand Search)
peteri » peterdi (Expand Search), peter (Expand Search), petri (Expand Search)
peterov » petrov (Expand Search)
petruov » petrov (Expand Search), peteruov (Expand Search), petriuov (Expand Search), petruuov (Expand Search)
petriuv » peteriuv (Expand Search), petriiuv (Expand Search), petruiuv (Expand Search)
petr » peter (Expand Search), petri (Expand Search), petru (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 ((peteruv OR petriuv) OR (((petrou OR peteri) OR (peterov OR petruov)) OR (petr OR per))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((peteruv OR petriuv) OR (((petrou OR peteri) OR (peterov OR petruov)) OR (petr OR per))) o.s.*".