Perhaps you should try some spelling variations:
petroiov » petrov (Expand Search), peteroiov (Expand Search), petruoiov (Expand Search), petrooiov (Expand Search)
petrouiov » peterouiov (Expand Search), petruouiov (Expand Search), petroouiov (Expand Search)
petrooiov » peterooiov (Expand Search), petruooiov (Expand Search), petroooiov (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (Expand Search)
petruio » peteruio (Expand Search), petruuio (Expand Search), petrouio (Expand Search)
petrouoio » peterouoio (Expand Search), petruouoio (Expand Search), petroouoio (Expand Search)
petr » peter (Expand Search), petru (Expand Search), petro (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 ((petrouiov OR (petroiov OR petrooiov)) OR ((petri OR (petruio OR petrouoio)) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petrouiov OR (petroiov OR petrooiov)) OR ((petri OR (petruio OR petrouoio)) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petrouiov OR (petroiov OR petrooiov)) OR ((petri OR (petruio OR petrouoio)) OR petr)) o.s.*.