Perhaps you should try some spelling variations:
petr » petro (Expand Search), per (Expand Search)
petru » petrou (Expand Search), peru (Expand Search), pentru (Expand Search)
petri » petroi (Expand Search), peri (Expand Search)
petroov » petrooov (Expand Search), peroov (Expand Search), petrov (Expand Search)
petriu » petroiu (Expand Search), periu (Expand Search), petris (Expand Search)
petrouiu » petroouiu (Expand Search), perouiu (Expand Search)
petruow » petrouow (Expand Search), peruow (Expand Search), pentruow (Expand Search), petrow (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 (((petr OR (petru OR petri)) OR petroov) OR (((petriu OR petrouiu) OR petruow) OR peter)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petr OR (petru OR petri)) OR petroov) OR (((petriu OR petrouiu) OR petruow) OR peter)) o.s.*".