Perhaps you should try some spelling variations:
petroiv » petrov (Expand Search), petruoiv (Expand Search), petrooiv (Expand Search), peroiv (Expand Search)
petriov » petrov (Expand Search), petruiov (Expand Search), petroiov (Expand Search), periov (Expand Search)
petruv » petru (Expand Search), petrov (Expand Search), petruuv (Expand Search), petrouv (Expand Search), peruv (Expand Search)
petr » petru (Expand Search), petro (Expand Search), per (Expand Search)
petri » petrui (Expand Search), petroi (Expand Search), peri (Expand Search)
petroui » petruoui (Expand Search), petrooui (Expand Search), peroui (Expand Search)
peterv » peters (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 petriov) OR petruv) OR (petr OR peterv)) OR ((petri OR petroui) OR peter)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((petroiv OR petriov) OR petruv) OR (petr OR peterv)) OR ((petri OR petroui) OR peter)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((((petroiv OR petriov) OR petruv) OR (petr OR peterv)) OR ((petri OR petroui) OR peter)) o.s.*.