Perhaps you should try some spelling variations:
petroiov » petrov (Expand Search), peteroiov (Expand Search), petrioiov (Expand Search), petruoiov (Expand Search)
peteriiv » peterdi (Expand Search)
petroi » peteroi (Expand Search), petrioi (Expand Search), petruoi (Expand Search)
petriio » peteriio (Expand Search), petriiio (Expand Search), petruiio (Expand Search)
petriuuio » peteriuuio (Expand Search), petriiuuio (Expand Search), petruiuuio (Expand Search)
petr » peter (Expand Search), petri (Expand Search), petru (Expand Search)

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: fop ((petroiov OR (peteriv OR peteriiv)) OR ((petroi OR (petriio OR petriuuio)) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petroiov OR (peteriv OR peteriiv)) OR ((petroi OR (petriio OR petriuuio)) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petroiov OR (peteriv OR peteriiv)) OR ((petroi OR (petriio OR petriuuio)) OR petr)) o.s.*.