Perhaps you should try some spelling variations:
petruuiv » peteruuiv (Expand Search), petriuuiv (Expand Search), petruuuiv (Expand Search)
petrov » peterov (Expand Search), petriov (Expand Search), petruov (Expand Search)
petriio » peteriio (Expand Search), petriiio (Expand Search), petruiio (Expand Search)
petrui » peterui (Expand Search), petriui (Expand Search), petruui (Expand Search)
petruov » peteruov (Expand Search), petriuov (Expand Search), petruuov (Expand Search)
petr » peter (Expand Search), petri (Expand Search), petru (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 ((petruuiv OR periv) OR ((((petrov OR petriio) OR petrui) OR petruov) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petruuiv OR periv) OR ((((petrov OR petriio) OR petrui) OR petruov) OR petr)) o.s.*".