Perhaps you should try some spelling variations:
petriov » peteriov (Expand Search), petriiov (Expand Search), petruiov (Expand Search)
petruuuov » peteruuuov (Expand Search), petriuuuov (Expand Search), petruuuuov (Expand Search)
petriiiuuov » peteriiiuuov (Expand Search), petriiiiuuov (Expand Search), petruiiiuuov (Expand Search)
petruuiiuuov » peteruuiiuuov (Expand Search), petriuuiiuuov (Expand Search), petruuuiiuuov (Expand Search)
petruio » peteruio (Expand Search), petriuio (Expand Search), petruuio (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 ((petriov OR (petruuuov OR (petriiiuuov OR petruuiiuuov))) OR (petruio OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petriov OR (petruuuov OR (petriiiuuov OR petruuiiuuov))) OR (petruio OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petriov OR (petruuuov OR (petriiiuuov OR petruuiiuuov))) OR (petruio OR petr)) o.s.*.