Perhaps you should try some spelling variations:
petrooiv » petrov (Expand Search), peterooiv (Expand Search), petriooiv (Expand Search), petruooiv (Expand Search)
petrouiv » petrov (Expand Search), peterouiv (Expand Search), petriouiv (Expand Search), petruouiv (Expand Search)
peteriiv » peterdi (Expand Search)
petriuuuiiv » peteriuuuiiv (Expand Search), petriiuuuiiv (Expand Search), petruiuuuiiv (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 (((petrooiv OR petrouiv) OR (peteriiv OR petriuuuiiv)) OR (petrui OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petrooiv OR petrouiv) OR (peteriiv OR petriuuuiiv)) OR (petrui OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (((petrooiv OR petrouiv) OR (peteriiv OR petriuuuiiv)) OR (petrui OR petr)) o.s.*.