Perhaps you should try some spelling variations:
petroi » petrow (Expand Search), peteroi (Expand Search), peroi (Expand Search)
petrui » pentrui (Expand Search), peterui (Expand Search), perui (Expand Search)
petru » pentru (Expand Search), peteru (Expand Search), peru (Expand Search)
petro » petero (Expand Search), pero (Expand Search)
petrov » peterov (Expand Search), perov (Expand Search)
petr » peter (Expand Search), per (Expand Search)
petri » peteri (Expand Search), peri (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 (peterov OR (((petroi OR (petro OR petrov)) OR (petrui OR petru)) OR (petr OR petri))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (peterov OR (((petroi OR (petro OR petrov)) OR (petrui OR petru)) OR (petr OR petri))) o.s.*".