Perhaps you should try some spelling variations:
petrov » peterov (Expand Search), petriov (Expand Search), petroov (Expand Search)
petroiv » peteroiv (Expand Search), petrioiv (Expand Search), petrooiv (Expand Search)
petrooio » peterooio (Expand Search), petriooio (Expand Search), petroooio (Expand Search)
petriio » peteriio (Expand Search), petriiio (Expand Search), petroiio (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 ((petrov OR (petroiv OR peteriv)) OR (((petrooio OR petriio) OR petru) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petrov OR (petroiv OR peteriv)) OR (((petrooio OR petriio) OR petru) OR petr)) o.s.*".