Perhaps you should try some spelling variations:
petroov » petrov (Expand Search), peteroov (Expand Search), petruoov (Expand Search), petrooov (Expand Search)
petruuiov » peteruuiov (Expand Search), petruuuiov (Expand Search), petrouuiov (Expand Search)
petruuo » peteruuo (Expand Search), petruuuo (Expand Search), petrouuo (Expand Search)
petriuo » peteriuo (Expand Search), petruiuo (Expand Search), petroiuo (Expand Search)
petr » peter (Expand Search), petru (Expand Search), petro (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (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 ((petruuiov OR petroov) OR ((petruuo OR (petriuo OR peteriuo)) OR (petr OR petri))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petruuiov OR petroov) OR ((petruuo OR (petriuo OR peteriuo)) OR (petr OR petri))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petruuiov OR petroov) OR ((petruuo OR (petriuo OR peteriuo)) OR (petr OR petri))) o.s.*.