Perhaps you should try some spelling variations:
petra » petru (Expand Search), petre (Expand Search), petera (Expand Search), petrua (Expand Search), pera (Expand Search)
petr » peter (Expand Search), petru (Expand Search), per (Expand Search)
petro » petero (Expand Search), petruo (Expand Search), pero (Expand Search), petrov (Expand Search), petru (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), peri (Expand Search)
peterov » petrov (Expand Search)
peteru » peter (Expand Search), petru (Expand Search), peters (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 ((((petra OR petr) OR petro) o) OR (((petri OR peterov) OR peteru) _)). s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((petra OR petr) OR petro) o) OR (((petri OR peterov) OR peteru) _)). s.*".