Perhaps you should try some spelling variations:
helped farmers » helps farmers
sheep farmers » sheep farming, sheep eaters
hemp farmers » helps farmers, shrimp farmers, hemp fibers
sheep farms » sheep farming

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: ((((hemp farmers) OR (helped farmers))) OR (((sheep farmers) OR (sheep farms)))) / badlands (s.d. AND neb.).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((hemp farmers) or (helped farmers))) or (((sheep farmers) OR (sheep farms)))) / badlands (s.d. and neb.)".
• Adding a wildcard symbol may retrieve word variants: ((((hemp farmers) or (helped farmers))) or (((sheep farmers) OR (sheep farms)))) / badlands (s.d. and neb.)*.