Perhaps you should try some spelling variations:
peterov » petrov (Expand Search)
petruov » petrov (Expand Search), peteruov (Expand Search), petruuov (Expand Search), petrouov (Expand Search)
peterv » peter (Expand Search), peters (Expand Search)
petris » peteris (Expand Search), petruis (Expand Search), petrois (Expand Search)
petr » peter (Expand Search), petru (Expand Search), petro (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (Expand Search)
petruv » peteruv (Expand Search), petruuv (Expand Search), petrouv (Expand Search), petru (Expand Search), petrov (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 ((petris OR ((peterov OR petruov) OR peterv)) OR (petr OR ((petri OR petruv) OR petruv))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petris OR ((peterov OR petruov) OR peterv)) OR (petr OR ((petri OR petruv) OR petruv))) o.s.*".