Perhaps you should try some spelling variations:
petrouov » petrov (Expand Search), peterouov (Expand Search), petruouov (Expand Search), petroouov (Expand Search)
peri » per (Expand Search)
petroiuov » peteroiuov (Expand Search), petruoiuov (Expand Search), petrooiuov (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (Expand Search)
petrui » peterui (Expand Search), petruui (Expand Search), petroui (Expand Search)
petroi » peteroi (Expand Search), petruoi (Expand Search), petrooi (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 ((petrouov OR petroiuov) OR ((((petri OR petrui) OR petroi) OR peri) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petrouov OR petroiuov) OR ((((petri OR petrui) OR petroi) OR peri) OR petr)) o.s.*".