Perhaps you should try some spelling variations:
petruov » peteruov (Expand Search), petriuov (Expand Search), petrouov (Expand Search)
petrov » peterov (Expand Search), petriov (Expand Search), petroov (Expand Search)
petruiv » peteruiv (Expand Search), petriuiv (Expand Search), petrouiv (Expand Search)
petrv » peterv (Expand Search), petriv (Expand Search), petrov (Expand Search)
petru » peteru (Expand Search), petriu (Expand Search), petrou (Expand Search)
petr » peter (Expand Search), petri (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 ((((petruov OR petrov) OR (peteriv OR petruiv)) OR petrv) OR (petru OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((petruov OR petrov) OR (peteriv OR petruiv)) OR petrv) OR (petru OR petr)) o.s.*".