Perhaps you should try some spelling variations:
increase field » increase yield (Expand search), increases yield (Expand search), increased yield (Expand search)
field subjects » aged subjects (Expand search), field projects (Expand search)
decrease urea » decrease treg (Expand search), decrease burden (Expand search), decreases areas (Expand search)
urea decrease » urea increases (Expand search), the decrease (Expand search), or decrease (Expand search)
decrease risk » decreased risk (Expand search), increase risk (Expand search), decrease in (Expand search)
risk decrease » risk decreases (Expand search), risk increase (Expand search), break decrease (Expand search)
decrease akt » decrease at (Expand search), decrease and (Expand search), decrease after (Expand search)
akt increase » gait increase (Expand search), ants increase (Expand search), and increase (Expand search)

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: "(( decrease urea decrease risk decrease ) OR ( decrease akt increase field subjects ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease urea decrease risk decrease ) OR ( decrease akt increase field subjects ))*.