Perhaps you should try some spelling variations:
petriov » peteriov (Expand Search), petriiov (Expand Search), petroiov (Expand Search)
petrioiov » peterioiov (Expand Search), petriioiov (Expand Search), petroioiov (Expand Search)
petru » peteru (Expand Search), petriu (Expand Search), petrou (Expand Search)
petrouo » peterouo (Expand Search), petriouo (Expand Search), petroouo (Expand Search)
petrouuuo » peterouuuo (Expand Search), petriouuuo (Expand Search), petroouuuo (Expand Search)
petr » peter (Expand Search), petri (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 petrioiov) OR (((petru OR petrouo) OR (peteruuo OR petrouuuo)) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petriov OR petrioiov) OR (((petru OR petrouo) OR (peteruuo OR petrouuuo)) OR petr)) o.s.*".