Perhaps you should try some spelling variations:
peru » petru (Expand Search), per (Expand Search)
petroov » peteroov (Expand Search), petruoov (Expand Search), petrooov (Expand Search)
petruv » peteruv (Expand Search), petruuv (Expand Search), petrouv (Expand Search)
petrv » peterv (Expand Search), petruv (Expand Search), petrov (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (Expand Search)
petruio » peteruio (Expand Search), petruuio (Expand Search), petrouio (Expand Search)
petr » peter (Expand Search), petru (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 petruv) OR petrv) OR (((petri OR peru) OR (petruio OR peterio)) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petroov OR petruv) OR petrv) OR (((petri OR peru) OR (petruio OR peterio)) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (((petroov OR petruv) OR petrv) OR (((petri OR peru) OR (petruio OR peterio)) OR petr)) o.s.*.