Perhaps you should try some spelling variations:
crop adoption » erp adoption, crop adaptation
era adoption » ema adoption, esa adoption, a adoption
energy crop » energy crops
e adoption » 4 adoption, 5 adoption, 6 adoption
3 adoption » _ adoption, 2 adoption, 3 adsorption
energy era » energy e, energy end

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "\"((((\\"energy crop adoption\\") or (\\"energy ((e adoption) OR (3 adoption))\\"))) or (\\"energy era adoption\\"))\"".
• Removing quotes may allow a broader search: (((( energy crop adoption ) or ( energy ((e adoption) OR (3 adoption)) ))) or ( energy era adoption )).