Perhaps you should try some spelling variations:
petriov » peteriov (Expand Search), petriiov (Expand Search), petroiov (Expand Search)
petroov » peteroov (Expand Search), petrioov (Expand Search), petrooov (Expand Search)
petriouov » peteriouov (Expand Search), petriiouov (Expand Search), petroiouov (Expand Search)
petriiouov » peteriiouov (Expand Search), petriiiouov (Expand Search), petroiiouov (Expand Search)
petru » peteru (Expand Search), petriu (Expand Search), petrou (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 petroov) OR (petriouov OR (petriouov OR petriiouov))) OR (petru OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petriov OR petroov) OR (petriouov OR (petriouov OR petriiouov))) OR (petru OR petr)) o.s.*".