Perhaps you should try some spelling variations:
petruov » peteruov (Expand Search), petriuov (Expand Search), petruuov (Expand Search)
petriov » peteriov (Expand Search), petriiov (Expand Search), petruiov (Expand Search)
petriuio » peteriuio (Expand Search), petriiuio (Expand Search), petruiuio (Expand Search)
petriiuio » peteriiuio (Expand Search), petriiiuio (Expand Search), petruiiuio (Expand Search)
petriiiuio » peteriiiuio (Expand Search), petriiiiuio (Expand Search), petruiiiuio (Expand Search)
petruiuio » peteruiuio (Expand Search), petriuiuio (Expand Search), petruuiuio (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 ((petruov OR petriov) OR (((petriuio OR (petriiuio OR petriiiuio)) OR petruiuio) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petruov OR petriov) OR (((petriuio OR (petriiuio OR petriiiuio)) OR petruiuio) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petruov OR petriov) OR (((petriuio OR (petriiuio OR petriiiuio)) OR petruiuio) OR petr)) o.s.*.