Perhaps you should try some spelling variations:
"prevost de grand" » "prevost des grand", "prevost _ grand", "prevost abbe grand", "prevost de grande", "prevost de grands", "prevost de grandi"
"prevot des grand" » "prevot des grands", "prevot des brand", "prevot des grandes"
"prost de gard" » "post de gard", "trost der gard", "joost de gard", "prost de garde", "prost de gand", "prost de gare"

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (("prost de gard") OR ((("prevost de grand") OR ("prevot des grand")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"prost de gard\") or (((\"prevost de grand\") OR (\"prevot des grand\"))))".
• Removing quotes may allow a broader search: (( prost de gard ) or ((( prevost de grand ) OR ( prevot des grand )))).
• Adding a wildcard symbol may retrieve word variants: (("prost de gard") or ((("prevost de grand") OR ("prevot des grand"))))*.