Perhaps you should try some spelling variations:
"prevost de grand" » "prevost des grand", "prevot des grand", "prevost _ grand", "prevost de grande", "prevost de grands", "prevost de grandi"
"trost der gard" » "rost der gard", "lost der gard", "trost der agard", "trost der gad", "trost der gar"
"prost de gard" » "post de gard", "joost de gard", "rost der 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 ("trost der gard"))) OR ("prevost de grand")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"prost de gard\") OR (\"trost der gard\"))) or (\"prevost de grand\"))".
• Removing quotes may allow a broader search: (((( prost de gard ) OR ( trost der gard ))) or ( prevost de grand )).
• Adding a wildcard symbol may retrieve word variants: (((("prost de gard") OR ("trost der gard"))) or ("prevost de grand"))*.