Perhaps you should try some spelling variations:
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 toc » decrease of (Expand search), decrease the (Expand search), decreased to (Expand search)
toc increase » c increase (Expand search), co2 increase (Expand search), cox increase (Expand search)
field object » field objects (Expand search), fields objects (Expand search), field subject (Expand search)
decrease il » decreased il (Expand search), decrease in (Expand search), decrease hiv (Expand search)
il decrease » l decrease (Expand search), will decrease (Expand search), oil decreases (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 il decrease AND decrease ) OR ( decrease toc increase field object ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease il decrease and decrease ) OR ( decrease toc increase field object ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease il decrease and decrease ) OR ( decrease toc increase field object ))*.