Perhaps you should try some spelling variations:
petriuov » petrov (Expand Search), peteriuov (Expand Search), petriiuov (Expand Search), petruiuov (Expand Search)
petroov » peteroov (Expand Search), petrioov (Expand Search), petruoov (Expand Search)
petriui » peteriui (Expand Search), petriiui (Expand Search), petruiui (Expand Search)
petruiuo » peteruiuo (Expand Search), petriuiuo (Expand Search), petruuiuo (Expand Search)
petroouiuo » peteroouiuo (Expand Search), petrioouiuo (Expand Search), petruoouiuo (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 ((petriuov OR petroov) OR ((petriui OR (petruiuo OR petroouiuo)) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petriuov OR petroov) OR ((petriui OR (petruiuo OR petroouiuo)) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petriuov OR petroov) OR ((petriui OR (petruiuo OR petroouiuo)) OR petr)) o.s.*.