Perhaps you should try some spelling variations:
petroiv » petrov (Expand Search), peteroiv (Expand Search), petruoiv (Expand Search), petrooiv (Expand Search), petrovv (Expand Search), petrowv (Expand Search)
petruuiu » peteruuiu (Expand Search), petruuuiu (Expand Search), petrouuiu (Expand Search)
petris » peteris (Expand Search), petruis (Expand Search), petrois (Expand Search)
petr » peter (Expand Search), petru (Expand Search), petro (Expand Search)
petroi » peteroi (Expand Search), petruoi (Expand Search), petrooi (Expand Search), petro (Expand Search), petrov (Expand Search), petrow (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 ((peteriv OR petroiv) OR ((petruuiu OR petris) OR (petr OR (petroi OR petri)))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((peteriv OR petroiv) OR ((petruuiu OR petris) OR (petr OR (petroi OR petri)))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((peteriv OR petroiv) OR ((petruuiu OR petris) OR (petr OR (petroi OR petri)))) o.s.*.