Perhaps you should try some spelling variations:
petrov » petro (Expand Search), peterov (Expand Search), petruov (Expand Search), petroov (Expand Search)
peteruo » petero (Expand Search), petruo (Expand Search), peterso (Expand Search)
peteru » peter (Expand Search), petru (Expand Search), peters (Expand Search)
petr » peter (Expand Search), petru (Expand Search), petro (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (Expand Search)
peteri » peterdi (Expand Search), peter (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 (petrov OR ((peteruo OR peteru) OR (petr OR (peteri OR (petri OR peteri))))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (petrov OR ((peteruo OR peteru) OR (petr OR (peteri OR (petri OR peteri))))) o.s.*".