Perhaps you should try some spelling variations:
petriov » petrov (Expand Search), peteriov (Expand Search), petruiov (Expand Search), petroiov (Expand Search)
petero » peter (Expand Search), peters (Expand Search), petro (Expand Search)
petruuiiv » peteruuiiv (Expand Search), petruuuiiv (Expand Search), petrouuiiv (Expand Search)
petriiuiiov » peteriiuiiov (Expand Search), petruiiuiiov (Expand Search), petroiiuiiov (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 ((petruuiiv OR (petriov OR (peteruiiov OR petriiuiiov))) OR (petero OR (petr OR petri))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petruuiiv OR (petriov OR (peteruiiov OR petriiuiiov))) OR (petero OR (petr OR petri))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petruuiiv OR (petriov OR (peteruiiov OR petriiuiiov))) OR (petero OR (petr OR petri))) o.s.*.