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