Perhaps you should try some spelling variations:
petriov » peteriov (Expand Search), petruiov (Expand Search), petroiov (Expand Search)
petroiov » peteroiov (Expand Search), petruoiov (Expand Search), petrooiov (Expand Search)
petrov » peterov (Expand Search), petruov (Expand Search), petroov (Expand Search)
petroiv » peteroiv (Expand Search), petruoiv (Expand Search), petrooiv (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (Expand Search)
petr » peter (Expand Search), petru (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 ((((petriov OR (petroiov OR petrov)) OR peteruiiov) OR petroiv) OR (petri OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((petriov OR (petroiov OR petrov)) OR peteruiiov) OR petroiv) OR (petri OR petr)) o.s.*".