Perhaps you should try some spelling variations:
petroiov » petrov (Expand Search), peteroiov (Expand Search), petruoiov (Expand Search), petrooiov (Expand Search)
petriov » peteriov (Expand Search), petruiov (Expand Search), petroiov (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (Expand Search)
petrio » peterio (Expand Search), petruio (Expand Search), petroio (Expand Search)
petruoio » peteruoio (Expand Search), petruuoio (Expand Search), petrouoio (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 ((petri OR (petrio OR petruoio)) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petriov OR petroiov) OR ((petri OR (petrio OR petruoio)) OR petr)) o.s.*".