Perhaps you should try some spelling variations:
petriiov » petrov (Expand Search), peteriiov (Expand Search), petriiiov (Expand Search), petruiiov (Expand Search)
petriuov » petrov (Expand Search), peteriuov (Expand Search), petriiuov (Expand Search), petruiuov (Expand Search)
petruov » peteruov (Expand Search), petriuov (Expand Search), petruuov (Expand Search)
petruuio » peteruuio (Expand Search), petriuuio (Expand Search), petruuuio (Expand Search)
petriuuio » peteriuuio (Expand Search), petriiuuio (Expand Search), petruiuuio (Expand Search)
petruiuuio » peteruiuuio (Expand Search), petriuiuuio (Expand Search), petruuiuuio (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 ((petriiov OR (petruov OR petriuov)) OR (((petruuio OR petriuuio) OR petruiuuio) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petriiov OR (petruov OR petriuov)) OR (((petruuio OR petriuuio) OR petruiuuio) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petriiov OR (petruov OR petriuov)) OR (((petruuio OR petriuuio) OR petruiuuio) OR petr)) o.s.*.