Perhaps you should try some spelling variations:
petruv » petru (Expand Search), petrov (Expand Search), peteruv (Expand Search), petriuv (Expand Search), petruuv (Expand Search)
peterov » petrov (Expand Search)
pero » petro (Expand Search), per (Expand Search), pro (Expand Search)
petrui » petri (Expand Search), petru (Expand Search), peterui (Expand Search), petriui (Expand Search), petruui (Expand Search)
petriuo » peteriuo (Expand Search), petriiuo (Expand Search), petruiuo (Expand Search)
petruuo » peteruuo (Expand Search), petriuuo (Expand Search), petruuuo (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 ((petruv OR peterov) OR (((pero OR petrui) OR ((petriuo OR petruuo) OR petr)) OR petrui)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petruv OR peterov) OR (((pero OR petrui) OR ((petriuo OR petruuo) OR petr)) OR petrui)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petruv OR peterov) OR (((pero OR petrui) OR ((petriuo OR petruuo) OR petr)) OR petrui)) o.s.*.