Perhaps you should try some spelling variations:
"prairie corn grass" » "prairie cord grass", "prairie city grass", "prairie vole grass", "prairie corn grains", "prairie corn grain"
"prairie town grass" » "prairie vole grass", "prince town grass", "prairie cord grass", "prairie lawn grass", "prairie town gas", "prairie sown grasses"
"prairie dogs grass" » "prairie dog's grass", "prairie dogs glass"

Try widening your search to All Fields.

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: (((("prairie corn grass") OR ("prairie dogs grass"))) OR ("prairie town grass")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"prairie corn grass\") OR (\"prairie dogs grass\"))) or (\"prairie town grass\"))".
• Removing quotes may allow a broader search: (((( prairie corn grass ) OR ( prairie dogs grass ))) or ( prairie town grass )).
• Adding a wildcard symbol may retrieve word variants: (((("prairie corn grass") OR ("prairie dogs grass"))) or ("prairie town grass"))*.