Perhaps you should try some spelling variations:
petruv » petru (Expand Search), petrov (Expand Search), peteruv (Expand Search), petruuv (Expand Search), petrouv (Expand Search)
petrois » petris (Expand Search), peterois (Expand Search), petruois (Expand Search), petroois (Expand Search)
pero » petro (Expand Search), per (Expand Search), pro (Expand Search)
petruov » petrov (Expand Search), peteruov (Expand Search), petruuov (Expand Search), petrouov (Expand Search)
petr » peter (Expand Search), petru (Expand Search), petro (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (Expand Search)
peteru » peter (Expand Search), petru (Expand Search), peters (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 petrois) OR ((pero OR petruov) OR (petr OR (peteru OR petri)))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petruv OR petrois) OR ((pero OR petruov) OR (petr OR (peteru OR petri)))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petruv OR petrois) OR ((pero OR petruov) OR (petr OR (peteru OR petri)))) o.s.*.