Perhaps you should try some spelling variations:
petroov » petrov (Expand Search), petrooov (Expand Search), peroov (Expand Search)
pero » petro (Expand Search), per (Expand Search), pro (Expand Search)
petr » petro (Expand Search), per (Expand Search)
petriov » petroiov (Expand Search), periov (Expand Search), petrov (Expand Search)
petri » petroi (Expand Search), peri (Expand Search)
petriii » petroiii (Expand Search), periii (Expand Search)
petru » petrou (Expand Search), peru (Expand Search), pentru (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 (((petroov OR (pero OR petr)) OR petriov) OR ((petri OR (petriii OR petru)) OR peter)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petroov OR (pero OR petr)) OR petriov) OR ((petri OR (petriii OR petru)) OR peter)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (((petroov OR (pero OR petr)) OR petriov) OR ((petri OR (petriii OR petru)) OR peter)) o.s.*.