Perhaps you should try some spelling variations:
decrease variable » decrease variability (Expand search), decreases available (Expand search), discrete variable (Expand search)
variable pattern » variable matter (Expand search), variate pattern (Expand search), variable water (Expand search)
increase costs » increased costs (Expand search), increases costs (Expand search), decrease costs (Expand search)
costs decrease » loss decrease (Expand search), not decrease (Expand search), cells decrease (Expand search)
decrease and » decreases and (Expand search), decrease in (Expand search), decrease of (Expand search)
and increase » and increases (Expand search), and increased (Expand search)
decrease akt » decrease at (Expand search), decrease after (Expand search), decrease with (Expand search)
akt decrease » and decrease (Expand search), not decrease (Expand search), any decrease (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 AND increase costs decrease ) OR ( decrease akt decrease variable pattern ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease and increase costs decrease ) OR ( decrease akt decrease variable pattern ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease and increase costs decrease ) OR ( decrease akt decrease variable pattern ))*.