Perhaps you should try some spelling variations:
petriiv » peteriiv (Expand Search), petriiiv (Expand Search), petroiiv (Expand Search)
petroiiiv » peteroiiiv (Expand Search), petrioiiiv (Expand Search), petrooiiiv (Expand Search)
petriuiiv » peteriuiiv (Expand Search), petriiuiiv (Expand Search), petroiuiiv (Expand Search)
petru » peteru (Expand Search), petriu (Expand Search), petrou (Expand Search)
petruv » peteruv (Expand Search), petriuv (Expand Search), petrouv (Expand Search)
petr » peter (Expand Search), petri (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 (((petriiv OR petroiiiv) OR petriuiiv) OR ((petru OR (petruv OR peteruv)) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petriiv OR petroiiiv) OR petriuiiv) OR ((petru OR (petruv OR peteruv)) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (((petriiv OR petroiiiv) OR petriuiiv) OR ((petru OR (petruv OR peteruv)) OR petr)) o.s.*.