Perhaps you should try some spelling variations:
petriov » peteriov (Expand Search), petriiov (Expand Search), petruiov (Expand Search)
petriou » peteriou (Expand Search), petriiou (Expand Search), petruiou (Expand Search)
petriiou » peteriiou (Expand Search), petriiiou (Expand Search), petruiiou (Expand Search)
petruiu » peteruiu (Expand Search), petriuiu (Expand Search), petruuiu (Expand Search)
petruoiu » peteruoiu (Expand Search), petriuoiu (Expand Search), petruuoiu (Expand Search)
petruuo » peteruuo (Expand Search), petriuuo (Expand Search), petruuuo (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 (petriov OR ((((petriou OR petriiou) OR (petruiu OR petruoiu)) OR petruuo) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (petriov OR ((((petriou OR petriiou) OR (petruiu OR petruoiu)) OR petruuo) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (petriov OR ((((petriou OR petriiou) OR (petruiu OR petruoiu)) OR petruuo) OR petr)) o.s.*.