Perhaps you should try some spelling variations:
peterov » petrov (Expand Search)
petruov » petrov (Expand Search), peteruov (Expand Search), petruuov (Expand Search), petrouov (Expand Search)
petruuiuv » peteruuiuv (Expand Search), petruuuiuv (Expand Search), petrouuiuv (Expand Search)
petruio » peteruio (Expand Search), petruuio (Expand Search), petrouio (Expand Search)
petr » peter (Expand Search), petru (Expand Search), petro (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (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 petruov) OR petruuiuv) OR ((peterio OR petruio) OR (petr OR petri))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((peterov OR petruov) OR petruuiuv) OR ((peterio OR petruio) OR (petr OR petri))) o.s.*".