Perhaps you should try some spelling variations:
petr » petri (Expand Search), petru (Expand Search), petro (Expand Search)
petrv » petriv (Expand Search), petruv (Expand Search), petrov (Expand Search), petri (Expand Search), petru (Expand Search)
petruv » petriuv (Expand Search), petruuv (Expand Search), petrouv (Expand Search), petru (Expand Search), petrov (Expand Search)
petruuv » petriuuv (Expand Search), petruuuv (Expand Search), petrouuv (Expand Search)
petrui » petriui (Expand Search), petruui (Expand Search), petroui (Expand Search), petri (Expand Search), petru (Expand Search)
petroi » petrioi (Expand Search), petruoi (Expand Search), petrooi (Expand Search), petri (Expand Search), petro (Expand Search), petrov (Expand Search)
peters » petersen (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 (petrv OR (petruv OR petruuv))) OR (petrui OR ((petroi OR peters) OR peter))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petr OR (petrv OR (petruv OR petruuv))) OR (petrui OR ((petroi OR peters) OR peter))) o.s.*".