Perhaps you should try some spelling variations:
petrov » peterov (Expand Search), petruov (Expand Search), petroov (Expand Search)
petriuov » peteriuov (Expand Search), petruiuov (Expand Search), petroiuov (Expand Search)
petriiov » peteriiov (Expand Search), petruiiov (Expand Search), petroiiov (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (Expand Search)
petruio » peteruio (Expand Search), petruuio (Expand Search), petrouio (Expand Search)
petr » peter (Expand Search), petru (Expand Search), petro (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 (petrov OR petriuov)) OR petriiov) OR ((petri OR petruio) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((peterov OR (petrov OR petriuov)) OR petriiov) OR ((petri OR petruio) OR petr)) o.s.*".