Perhaps you should try some spelling variations:
petrou » petru (Expand Search), petro (Expand Search), petrov (Expand Search), peterou (Expand Search), petruou (Expand Search), petroou (Expand Search)
petr » peter (Expand Search), petru (Expand Search), petro (Expand Search)
petroow » peteroow (Expand Search), petruoow (Expand Search), petrooow (Expand Search)
petrow » peterow (Expand Search), petruow (Expand Search), petroow (Expand Search), petro (Expand Search), petrov (Expand Search), petrowna (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 (petrou OR ((petr OR (petroow OR petrow)) OR (perui OR petri))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (petrou OR ((petr OR (petroow OR petrow)) OR (perui OR petri))) o.s.*".