Perhaps you should try some spelling variations:
"fop petruv OR peteruv OR petruuv OR petrio OR perio OR petr OR per OR petri o.s.*" » "fop petru OR peteruv OR petruuv OR petrio OR perio OR petr OR per OR petri o.s.*" (Expand Search), "fop petrov OR peteruv OR petruuv OR petrio OR perio OR petr OR per OR petri o.s.*" (Expand Search), "fop petruv OR peteruv OR petruuv OR petris OR perio OR petr OR per OR petri o.s.*" (Expand Search), "fop petruv OR peteruv OR petruuv OR petro OR perio OR petr OR per OR petri o.s.*" (Expand Search), "fop peteruv OR peteruv OR peteruuv OR peterio OR perio OR peter OR per OR peteri o.s.*" (Expand Search), "fop petruuv OR peteruv OR petruuuv OR petruio OR perio OR petru OR per OR petrui o.s.*" (Expand Search), "fop petrouv OR peteruv OR petrouuv OR petroio OR perio OR petro OR per OR petroi o.s.*" (Expand Search)

You may be able to get more results by adjusting your search query.

• Removing quotes may allow a broader search: fop (((petruv OR peteruv) OR petruuv) OR ((petrio OR perio) OR (petr OR (per OR petri)))) o.s.*.