Perhaps you should try some spelling variations:
petroiv » petrov (Expand Search), petrovv (Expand Search), petrowv (Expand Search), peteroiv (Expand Search), petruoiv (Expand Search), petrooiv (Expand Search)
petroi » petro (Expand Search), petrov (Expand Search), petrow (Expand Search), peteroi (Expand Search), petruoi (Expand Search), petrooi (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (Expand Search)
petr » peter (Expand Search), petru (Expand Search), petro (Expand Search)
petruov » peteruov (Expand Search), petruuov (Expand Search), petrouov (Expand Search), petrov (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 ((petroiv OR (petri OR petroi)) OR (petr OR ((petruov OR peteruv) OR petroiv))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petroiv OR (petri OR petroi)) OR (petr OR ((petruov OR peteruv) OR petroiv))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petroiv OR (petri OR petroi)) OR (petr OR ((petruov OR peteruv) OR petroiv))) o.s.*.