Perhaps you should try some spelling variations:
field processing » feed processing (Expand search), food processing (Expand search), seed processing (Expand search)
increase field » increase yield (Expand search), increases yield (Expand search), increased yield (Expand search)
decrease and » decreases and (Expand search), decrease in (Expand search), decrease of (Expand search)
and decrease » and decreases (Expand search), and decreased (Expand search), and increase (Expand search)
decrease akt » decrease at (Expand search), decrease after (Expand search), decrease with (Expand search)
akt decrease » not decrease (Expand search), any decrease (Expand search), salt decreases (Expand search)
decrease on » decrease in (Expand search), decrease of (Expand search), decrease or (Expand search)
on increase » on increased (Expand search), an increase (Expand search), in increase (Expand search)

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: (( decrease on increase field processing ) OR ( decrease AND decrease akt decrease ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease on increase field processing ) OR ( decrease and decrease akt decrease ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease on increase field processing ) OR ( decrease and decrease akt decrease ))*.