Perhaps you should try some spelling variations:
petr » petru (Expand Search), petro (Expand Search), per (Expand Search)
petrou » petruou (Expand Search), petroou (Expand Search), perou (Expand Search), petru (Expand Search), petro (Expand Search), petrov (Expand Search)
petroou » petruoou (Expand Search), petrooou (Expand Search), peroou (Expand Search)
petri » petrui (Expand Search), petroi (Expand Search), peri (Expand Search)
petroooi » petruoooi (Expand Search), petrooooi (Expand Search), peroooi (Expand Search)
peteri » peterdi (Expand Search), peters (Expand Search)

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petr OR (petrou OR petroou)) OR ((((petri OR peteri) OR petroooi) OR peter) OR peter)) _. s.~".
• Adding a wildcard symbol may retrieve word variants: fop ((petr OR (petrou OR petroou)) OR ((((petri OR peteri) OR petroooi) OR peter) OR peter)) _. s.*.