Perhaps you should try some spelling variations:
petriov » peteriov (Expand Search), petriiov (Expand Search), petruiov (Expand Search)
petriuiov » peteriuiov (Expand Search), petriiuiov (Expand Search), petruiuiov (Expand Search)
petruuuiiov » peteruuuiiov (Expand Search), petriuuuiiov (Expand Search), petruuuuiiov (Expand Search)
petruouo » peteruouo (Expand Search), petriuouo (Expand Search), petruuouo (Expand Search)
petrui » peterui (Expand Search), petriui (Expand Search), petruui (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 (petriuiov OR petruuuiiov)) OR ((petruouo OR petrui) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petriov OR (petriuiov OR petruuuiiov)) OR ((petruouo OR petrui) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petriov OR (petriuiov OR petruuuiiov)) OR ((petruouo OR petrui) OR petr)) o.s.*.