Perhaps you should try some spelling variations:
petriv » petris (Expand Search), petrov (Expand Search), peteriv (Expand Search), petruiv (Expand Search), petroiv (Expand Search)
petriu » petru (Expand Search), petris (Expand Search), peteriu (Expand Search), petruiu (Expand Search), petroiu (Expand Search)
petruiio » peteruiio (Expand Search), petruuiio (Expand Search), petrouiio (Expand Search)
petroiio » peteroiio (Expand Search), petruoiio (Expand Search), petrooiio (Expand Search)
petruooiio » peteruooiio (Expand Search), petruuooiio (Expand Search), petrouooiio (Expand Search)
petr » peter (Expand Search), petru (Expand Search), petro (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 (petriv OR ((petriu OR (petruiio OR (petroiio OR petruooiio))) OR (petr OR petri))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (petriv OR ((petriu OR (petruiio OR (petroiio OR petruooiio))) OR (petr OR petri))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (petriv OR ((petriu OR (petruiio OR (petroiio OR petruooiio))) OR (petr OR petri))) o.s.*.