Perhaps you should try some spelling variations:
peteriiv » peterdi (Expand Search)
petruiv » peteruiv (Expand Search), petriuiv (Expand Search), petruuiv (Expand Search)
petroov » peteroov (Expand Search), petrioov (Expand Search), petruoov (Expand Search)
petruv » peteruv (Expand Search), petriuv (Expand Search), petruuv (Expand Search)
petruui » peteruui (Expand Search), petriuui (Expand Search), petruuui (Expand Search)
petriio » peteriio (Expand Search), petriiio (Expand Search), petruiio (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 ((petruiv OR peteriiv) OR ((((petroov OR petruv) OR petruui) OR petriio) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petruiv OR peteriiv) OR ((((petroov OR petruv) OR petruui) OR petriio) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petruiv OR peteriiv) OR ((((petroov OR petruv) OR petruui) OR petriio) OR petr)) o.s.*.