Perhaps you should try some spelling variations:
petroov » peteroov (Expand Search), petrioov (Expand Search), petrooov (Expand Search)
petruuiv » peteruuiv (Expand Search), petriuuiv (Expand Search), petrouuiv (Expand Search)
petriuuiv » peteriuuiv (Expand Search), petriiuuiv (Expand Search), petroiuuiv (Expand Search)
petru » peteru (Expand Search), petriu (Expand Search), petrou (Expand Search)
petruo » peteruo (Expand Search), petriuo (Expand Search), petrouo (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 ((petroov OR (petruuiv OR petriuuiv)) OR (((petru OR petero) OR petruo) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petroov OR (petruuiv OR petriuuiv)) OR (((petru OR petero) OR petruo) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petroov OR (petruuiv OR petriuuiv)) OR (((petru OR petero) OR petruo) OR petr)) o.s.*.